UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-Q
x
Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
For the quarterly period ended March 31,June 30, 2019  
OR 
o
TRANSITION REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 
For the transition period from __________ to _________ 
Commission File Number 001-33503 
BLUEKNIGHT ENERGY PARTNERS, L.P.
(Exact name of registrant as specified in its charter)
Delaware
(State or other jurisdiction of incorporation or organization)
 
20-8536826
(IRS Employer
Identification No.)
   
201 NW 10th,6060 American Plaza, Suite 200600
Tulsa, Oklahoma City, Oklahoma 7310374135
(Address of principal executive offices, zip code)
 
Registrant’s telephone number, including area code: (405) 278-6400(918) 237-4000

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes    x    No   o
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes   x   No   o
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):
Large accelerated filer o
 
Accelerated filer x 
Non-accelerated filer o   
 
Smaller reporting company o
  
Emerging growth company o
 
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  o  No x 
Securities registered pursuant to Section 12(b) of the Exchange Act:
Title of each classTrading Symbol(s)Name of each exchange on which registered
Common UnitsBKEPThe Nasdaq Global Market
Series A Preferred UnitsBKEPPThe Nasdaq Global Market
 
 As of May 6,August 1, 2019, there were 35,125,202 Series A Preferred Units and 40,714,85740,813,488 common units outstanding.   

 




Table of Contents
  Page
FINANCIAL INFORMATION
Unaudited Condensed Consolidated Financial Statements
 Condensed Consolidated Balance Sheets as of December 31, 2018, and March 31,June 30, 2019
 Condensed Consolidated Statements of Operations for the Three and Six Months Ended March 31,June 30, 2018 and 2019
 Condensed Consolidated Statements of Changes in Partners’ Capital (Deficit) for the Three and Six Months Ended March 31,June 30, 2018 and 2019
 Condensed Consolidated Statements of Cash Flows for the ThreeSix Months Ended March 31,June 30, 2018 and 2019
 Notes to the Unaudited Condensed Consolidated Financial Statements
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures about Market Risk
Controls and Procedures
   
OTHER INFORMATION
Legal Proceedings
Risk Factors
Exhibits





i

Table of Contents

PART I. FINANCIAL INFORMATION

Item 1.    Unaudited Condensed Consolidated Financial Statements
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands, except unit data)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands, except unit data)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands, except unit data)
As of As ofAs of As of
December 31, 2018 March 31, 2019December 31, 2018 June 30, 2019
(unaudited)(unaudited)
ASSETS      
Current assets:      
Cash and cash equivalents$1,455
 $1,209
$1,455
 $1,542
Accounts receivable, net35,683
 28,561
35,683
 26,661
Receivables from related parties, net1,043
 936
1,043
 1,121
Other current assets9,345
 7,127
9,345
 7,477
Total current assets47,526
 37,833
47,526
 36,801
Property, plant and equipment, net of accumulated depreciation of $263,554 and $268,576 at December 31, 2018, and March 31, 2019, respectively248,261
 243,063
Property, plant and equipment, net of accumulated depreciation of $263,554 and $273,420 at December 31, 2018, and June 30, 2019, respectively248,261
 241,130
Goodwill6,728
 6,728
6,728
 6,728
Debt issuance costs, net3,349
 3,098
3,349
 2,846
Operating lease assets
 11,594

 12,009
Intangible assets, net16,834
 16,147
16,834
 15,461
Other noncurrent assets
606
 1,193
606
 1,287
Total assets$323,304
 $319,656
$323,304
 $316,262
LIABILITIES AND PARTNERS’ CAPITAL      
Current liabilities:      
Accounts payable$3,707
 $3,925
$3,707
 $3,793
Accounts payable to related parties2,263
 2,111
2,263
 3,125
Accrued crude oil purchases13,949
 7,576
13,949
 5,518
Accrued crude oil purchases to related parties10,219
 11,885
10,219
 10,180
Accrued interest payable465
 294
465
 394
Accrued property taxes payable3,089
 2,237
3,089
 3,098
Unearned revenue3,206
 3,536
3,206
 2,244
Unearned revenue with related parties4,835
 15,168
4,835
 7,739
Accrued payroll3,667
 2,129
3,667
 3,083
Current operating lease liability
 2,768

 2,682
Other current liabilities3,465
 3,042
3,465
 3,331
Total current liabilities48,865
 54,671
48,865
 45,187
Long-term unearned revenue with related parties1,714
 1,612
1,714
 1,607
Other long-term liabilities4,010
 3,715
4,010
 3,662
Noncurrent operating lease liability
 8,935

 9,402
Contingent liability with related party (Note 10)10,019
 10,870
10,019
 11,980
Long-term debt265,592
 252,592
265,592
 261,592
Commitments and contingencies (Note 16)
 

 
Partners’ capital:      
Common unitholders (40,424,372 and 40,714,857 units issued and outstanding at December 31, 2018, and March 31, 2019, respectively)370,972
 365,220
Common unitholders (40,424,372 and 40,714,857 units issued and outstanding at December 31, 2018, and June 30, 2019, respectively)370,972
 360,861
Preferred Units (35,125,202 units issued and outstanding at both dates)253,923
 253,923
253,923
 253,923
General partner interest (1.6% interest with 1,225,409 general partner units outstanding at both dates)(631,791) (631,882)(631,791) (631,952)
Total partners’ capital(6,896) (12,739)(6,896) (17,168)
Total liabilities and partners’ capital$323,304

$319,656
$323,304

$316,262
The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per unit data)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per unit data)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per unit data)
 Three Months ended
March 31,
Three Months ended June 30, Six Months ended June 30,
 2018 20192018 2019 2018 2019
 (unaudited)(unaudited)
Service revenue:           
Third-party revenue $17,318
 $15,886
$14,103
 $15,727
 $31,421
 $31,613
Related-party revenue 6,321
 4,219
6,063
 4,082
 12,384
 8,301
Lease revenue:           
Third-party revenue 9,804
 9,763
10,237
 9,819
 20,041
 19,582
Related-party revenue 7,703
 4,940
7,475
 4,812
 15,178
 9,752
Product sales revenue:           
Third-party revenue 3,514
 58,924
45,615
 59,636
 49,129
 118,560
Total revenue 44,660
 93,732
83,493
 94,076
 128,153
 187,808
Costs and expenses:           
Operating expense 31,135
 27,243
28,988
 25,915
 60,123
 53,158
Cost of product sales 2,637
 24,587
20,041
 20,510
 22,678
 45,097
Cost of product sales from related party 
 30,774
23,747
 36,421
 23,747
 67,195
General and administrative expense 4,221
 3,693
4,486
 2,962
 8,707
 6,655
Asset impairment expense 616
 1,119

 1,114
 616
 2,233
Total costs and expenses 38,609
 87,416
77,262
 86,922
 115,871
 174,338
Gain (loss) on sale of assets (236) 1,724
Gain on sale of assets599
 81
 363
 1,805
Operating income 5,815
 8,040
6,830
 7,235
 12,645
 15,275
Other income (expenses):           
Other income
 268
 
 268
Gain on sale of unconsolidated affiliate 2,225
 

 
 2,225
 
Interest expense (3,569) (4,271)(5,024) (4,134) (8,593) (8,405)
Income before income taxes 4,471
 3,769
1,806
 3,369
 6,277
 7,138
Provision for income taxes 29
 12
21
 13
 50
 25
Net income $4,442
 $3,757
$1,785
 $3,356
 $6,227
 $7,113
           
Allocation of net income for calculation of earnings per unit:           
General partner interest in net income $231
 $105
$28
 $53
 $259
 $158
Preferred interest in net income $6,278
 $6,279
$6,279
 $6,279
 $12,557
 $12,558
Net loss available to limited partners $(2,067) $(2,627)$(4,522) $(2,976) $(6,589) $(5,603)
           
Basic and diluted net loss per common unit $(0.05) $(0.06)$(0.11) $(0.07) $(0.16) $(0.13)
           
Weighted average common units outstanding - basic and diluted 40,289
 40,678
40,324
 40,715
 40,306
 40,696

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.


BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS’ CAPITAL (DEFICIT)
(in thousands)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS’ CAPITAL (DEFICIT)
(in thousands)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN PARTNERS’ CAPITAL (DEFICIT)
(in thousands)
Common Unitholders Series A Preferred Unitholders General Partner Interest Total Partners’ Capital (Deficit)Common Unitholders Series A Preferred Unitholders General Partner Interest Total Partners’ Capital (Deficit)
(unaudited)
Balance, March 31, 2018$446,471
 $253,923
 $(703,539) $(3,145)
Net income (loss)(4,681) 6,279
 187
 1,785
Equity-based incentive compensation636
 
 10
 646
Distributions(6,010) (6,279) (362) (12,651)
Balance, June 30, 2018$436,416
 $253,923
 $(703,704) $(13,365)
(unaudited)       
Balance, December 31, 2017$454,358
 $253,923
 $(703,597) $4,684
$454,358
 $253,923
 $(703,597) $4,684
Net income (loss)(2,065) 6,279
 228
 4,442
(6,745) 12,557
 415
 6,227
Equity-based incentive compensation33
 
 8
 41
669
 
 18
 687
Distributions(5,947) (6,279) (361) (12,587)(11,958) (12,557) (723) (25,238)
Capital contributions
 
 183
 183

 
 183
 183
Proceeds from sale of 21,246 common units pursuant to the Employee Unit Purchase Plan92
 
 
 92
92
 
 
 92
Balance, March 31, 2018$446,471
 $253,923
 $(703,539) $(3,145)
Balance, June 30, 2018$436,416
 $253,923
 $(703,704) $(13,365)
       


Common Unitholders Series A Preferred Unitholders General Partner Interest Total Partners’ Capital (Deficit)
Balance, March 31, 2019$365,220
 $253,923
 $(631,882) $(12,739)
Net income (loss)(2,976) 6,279
 53
 3,356
Equity-based incentive compensation289
 
 5
 294
Distributions(1,672) (6,279) (128) (8,079)
Balance, June 30, 2019$360,861
 $253,923
 $(631,952) $(17,168)
(unaudited)       
Balance, December 31, 2018$370,972
 $253,923
 $(631,791) $(6,896)$370,972
 $253,923
 $(631,791) $(6,896)
Net income (loss)(2,581) 6,279
 59
 3,757
(5,557) 12,558
 112
 7,113
Equity-based incentive compensation64
 
 5
 69
353
 
 10
 363
Distributions(3,308) (6,279) (155) (9,742)(4,980) (12,558) (283) (17,821)
Proceeds from sale of 63,340 common units pursuant to the Employee Unit Purchase Plan73
 
 
 73
73
 
 
 73
Balance, March 31, 2019$365,220
 $253,923
 $(631,882) $(12,739)
Balance, June 30, 2019$360,861
 $253,923
 $(631,952) $(17,168)

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
BLUEKNIGHT ENERGY PARTNERS, L.P.
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
Three Months ended
March 31,
Six Months ended June 30,
2018 20192018 2019
(unaudited)(unaudited)
Cash flows from operating activities:      
Net income$4,442
 $3,757
$6,227
 $7,113
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for uncollectible receivables from third parties8
 
1
 
Depreciation and amortization7,367
 6,734
14,779
 12,971
Amortization of debt issuance costs256
 251
949
 503
Unrealized (gain) loss related to interest rate swaps(354) 44
(314) 44
Intangible asset impairment charge189
 
189
 
Fixed asset impairment charge427
 1,119
427
 2,233
Loss (gain) on sale of assets236
 (1,724)
Gain on sale of assets(363) (1,805)
Gain on sale of unconsolidated affiliate(2,225) 
(2,225) 
Equity-based incentive compensation41
 69
687
 363
Changes in assets and liabilities:      
Decrease (increase) in accounts receivable(2,811) 4,480
(23,680) 7,116
Decrease in receivables from related parties960
 107
Decrease (increase) in receivables from related parties1,851
 (78)
Decrease (increase) in other current assets399
 2,613
(1,426) 3,425
Decrease in other non-current assets41
 803
90
 1,551
Decrease in accounts payable(154) (297)(502) (440)
Increase (decrease) in payables to related parties625
 (315)748
 (20)
Decrease in accrued crude oil purchases
 (6,373)
Increase in accrued crude oil purchases to related parties
 1,666
Increase (decrease) in accrued interest payable24
 (171)
Decrease in accrued property taxes(80) (852)
Increase in unearned revenue637
 165
Increase (decrease) in accrued crude oil purchases9,756
 (8,431)
Increase (decrease) in accrued crude oil purchases to related parties13,363
 (39)
Decrease in accrued interest payable(50) (71)
Increase in accrued property taxes933
 9
Decrease in unearned revenue(346) (1,334)
Increase in unearned revenue from related parties3,655
 10,231
3,679
 2,797
Decrease in accrued payroll(3,323) (1,538)(2,448) (584)
Decrease in other accrued liabilities(419) (1,252)(1,250) (2,385)
Net cash provided by operating activities9,941
 19,517
21,075
 22,938
Cash flows from investing activities:      
Acquisitions(21,959) 
(21,959) 
Capital expenditures(4,563) (2,801)(22,125) (6,240)
Proceeds from sale of assets26
 6,304
3,893
 6,351
Proceeds from sale of unconsolidated affiliate2,225
 
2,225
 
Net cash provided by (used in) investing activities(24,271) 3,503
(37,966) 111
Cash flows from financing activities:      
Payments on other financing activities(746) (597)(1,113) (1,214)
Debt issuance costs(309) 
Borrowings under credit agreement54,000
 75,000
113,000
 158,000
Payments under credit agreement(27,000) (88,000)(71,000) (162,000)
Proceeds from equity issuance92
 73
92
 73
Capital contributions183
 
183
 
Distributions(12,587) (9,742)(25,238) (17,821)
Net cash provided by (used in) financing activities13,942
 (23,266)15,615
 (22,962)
Net decrease in cash and cash equivalents(388) (246)
Net increase (decrease) in cash and cash equivalents(1,276) 87
Cash and cash equivalents at beginning of period2,469
 1,455
2,469
 1,455
Cash and cash equivalents at end of period$2,081
 $1,209
$1,193
 $1,542
      
Supplemental disclosure of non-cash financing and investing cash flow information:      
Non-cash changes in property, plant and equipment$1,251
 $711
$294
 $1,515
Increase in accrued liabilities related to insurance premium financing agreement$720
 $751
$1,578
 $1,912

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements. 

BLUEKNIGHT ENERGY PARTNERS, L.P.
NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
 
1.    ORGANIZATION AND NATURE OF BUSINESS
 
Blueknight Energy Partners, L.P. and subsidiaries (collectively, the “Partnership”) is a publicly traded master limited partnership with operations in 27 states. The Partnership provides integrated terminalling, gathering, transportation and marketing services for companies engaged in the production, distribution and marketing of crude oil and asphalt products. The Partnership manages its operations through four operating segments: (i) asphalt terminalling services, (ii) crude oil terminalling services, (iii) crude oil pipeline services and (iv) crude oil trucking services. The Partnership’s common units and preferred units, which represent limited partnership interests in the Partnership, are listed on the NASDAQ Global Market under the symbols “BKEP” and “BKEPP,” respectively. The Partnership was formed in February 2007 as a Delaware master limited partnership initially to own, operate and develop a diversified portfolio of complementary midstream energy assets.

2.    BASIS OF CONSOLIDATION AND PRESENTATION
 
The financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).  The condensed consolidated balance sheet as of March 31,June 30, 2019, the condensed consolidated statements of operations for the three and six months ended March 31,June 30, 2018 and 2019, the condensed consolidated statements of changes in partners’ capital (deficit) for the three and six months ended March 31,June 30, 2018 and 2019, and the condensed consolidated statements of cash flows for the threesix months ended March 31,June 30, 2018 and 2019, are unaudited.  In the opinion of management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the audited financial statements and include all adjustments necessary to state fairly the financial position and results of operations for the respective interim periods.  All adjustments are of a recurring nature unless otherwise disclosed herein.  The 2018 year-end condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by GAAP.  These unaudited condensed consolidated financial statements and notes should be read in conjunction with the consolidated financial statements and notes thereto included in the Partnership’s annual report on Form 10-K for the year ended December 31, 2018, filed with the Securities and Exchange Commission (the “SEC”) on March 12, 2019 (the “2018 Form 10-K”).  Interim financial results are not necessarily indicative of the results to be expected for an annual period.  The Partnership’s significant accounting policies are consistent with those disclosed in Note 3 of the Notes to Consolidated Financial Statements in its 2018 Form 10-K.10-K except for new accounting standards adopted in 2019 as discussed Note 3 and Note 14.

Certain reclassifications have been made in the consolidated balance sheet as of December 31, 2018, and the consolidated statement of cash flows for the threesix months ended March 31,June 30, 2018, to conform to the 2019 financial statement presentation. These reclassifications relate to items included in “Other current assets” and “Other noncurrent assets.” Reclassifications on the consolidated statement of cash flows were limited to the “Cash flows from operating activities” section. The reclassifications have no impact on net income.

3.    REVENUE

On January 1, 2019, the Partnership adopted the new accounting standard ASC 842 - Leases and all related amendments (“new lease standard”) using the modified retrospective method. Results for reporting periods beginning on January 1, 2019, are presented under the new lease standard, while prior period amounts are not adjusted and continue to be reported in accordance with the Partnership’s historic accounting under ASC 840 - Leases. The adoption of ASC 842 did not have a material effect on the Partnership’s revenue recognition. The primary impact is a change to the recognition of variable consideration that has both a service and lease component. Previously, the variable consideration related to the service component was estimated at the beginning of the contract year and recognized on a straight-line basis over the year. Under ASC 842, the variable consideration related to the service component is treated as a change in estimate in the period when the facts and circumstances on which the variable payment is based occur.

There are two types of contracts in the asphalt terminalling segment: (i) operating lease contracts, under which customers operate the facilities, and (ii) storage, throughput and handling contracts, under which the Partnership operates the facilities. The operating lease contracts are accounted for in accordance with ASC 842 - Leases. The storage, throughput and handling contracts contain both lease revenue and non-lease service revenue. In accordance with ASC 842 and 606, fixed consideration is allocated to the lease and service components based on their relative stand-alone selling price. The stand-alone selling price of the lease component is calculated using the average internal rate of return under the operating lease agreements. The stand-alone selling price of the service component is calculated by applying an appropriate margin to the expected costs to operate the facility. The service component contains a single performance obligation that consists of a stand-ready obligation to perform

activities as directed by the customer, and revenue is recognized on a straight-line basis over time as the customer receives and

consumes benefits. The lease component is recognized on a straight-line basis over the term of the initial lease. Fixed consideration, consisting of the monthly storage and handling fees, is billed a month prior to the performance of services and is due by the first day of the month of service. Payments received in advance of the month of service are recorded as unearned revenue until the service is performed, and the service component is treated as a contract liability.

Asphalt storage, throughput and handling contracts also contain variable consideration in the form of reimbursements of utility, fuel and power expenses and throughput fees. Utility, fuel and power reimbursements are allocated entirely to the service component of the contracts. Utility, fuel and power reimbursements relate directly to the distinct monthly service that makes up the overall performance obligation and revenue is recognized in the period in which the service takes place. Variable consideration related to reimbursements of utility, fuel and power expenses is billed in the month subsequent to the period of service, and payment is due within 30 days of billing. Throughput fees are allocated to both the lease and service component of the contracts using the allocation percentages from contract inception. In accordance with ASC 842, the lease component of variable throughput fees is recognized in the period when the changes in facts and circumstances on which the variable payment is based occur. Additionally, under ASC 842, when variable consideration contains both a lease and non-lease service component, the service component cannot be recognized until the period in which the changes in facts and circumstances on which the variable payment is based occur. At that time, it can be recognized in accordance with ASC 606. The service component of variable throughput fees is treated as a change in estimate in the period in when the changes in facts and circumstances on which the variable payment is based occur and is then recognized on a straight-line basis over time as the customer receives and consumes benefits. Payment on variable throughput consideration is due within 30 days of billing.

Certain asphalt storage, throughput and handling contracts contain provisions for reimbursement of specified major maintenance costs above a specified threshold over the life of the contract. Reimbursements of specified major maintenance costs are allocated to both the lease and service component of the contracts using the allocation percentages from contract inception. Reimbursements of specified major maintenance costs are reviewed and paid quarterly, which may result in overpayments that must be paid back to the customer in future years. As such, the service component of this consideration is constrained and recorded in unearned revenue (contract liability) until facts and circumstances indicate it is probable that the minimum threshold will be met. In the event the minimum threshold is not met, the Partnership will return the reimbursement to the customer.

As of March 31, 2019, the Partnership has serviceThe following table includes revenue associated with contractual commitments in place related to future performance obligations satisfied over time under asphalt storage, throughput and handling contracts thatas of the end of the reporting period, which are wholly or partially unsatisfied. The service revenue relatedexpected to these performance obligations will be recognized as followsin revenue in the specified periods (in thousands):
Revenue Related to Future Performance Obligations Due by Period(1)
  
Twelve months ending March 31, 2020 $30,705
Twelve months ending March 31, 2021 29,704
Twelve months ending March 31, 2022 25,487
Twelve months ending March 31, 2023 18,903
Twelve months ending March 31, 2024 11,711
Thereafter 7,841
Total revenue related to future performance obligations $124,351
  
Revenue from Contracts with Customers(1)
 Revenue from Leases
Remainder of 2019 $15,475
 $27,983
2020 30,391
 53,259
2021 27,240
 49,230
2022 19,937
 38,545
2023 14,533
 29,609
Thereafter 9,142
 22,342
Total revenue related to future performance obligations $116,718
 $220,968
____________________
(1)Excluded from the table is revenue that is either constrained or related to performance obligations that are wholly unsatisfied as of March 31,June 30, 2019.

In addition, as of March 31, 2019, the Partnership has minimum future annual lease rentals contracted to be received under asphalt operating lease contracts and asphalt storage, throughput and handling contracts. The lease revenue related to these minimum rentals will be recognized as follows (in thousands):
Revenue Related to Minimum Future Annual Lease Rentals Due by Period  
Twelve months ending March 31, 2020 $55,176
Twelve months ending March 31, 2021 52,360
Twelve months ending March 31, 2022 46,637
Twelve months ending March 31, 2023 36,655
Twelve months ending March 31, 2024 24,798
Thereafter 19,220
Total revenue related to minimum future annual lease rentals $234,846

Crude oil terminalling services contracts can be either short- or long-term written contracts. The contracts contain a single performance obligation that consists of a series of distinct services provided over time. Customers are billed a month prior to the performance of terminalling services and payment is due by the first day of the month of service. Payments received in advance of the month of service are recorded as unearned revenue (contract liability) until the service is performed. These contracts also contain provisions under which customers are invoiced for product throughput in the month following the month in which the service is provided. Payment on product throughput is due within 30 days. The Partnership has elected to use the right-to-invoice expedient on crude oil terminalling services contracts as the right to consideration corresponds directly with the value to the customer of performance completed to date.

There are primarily two types of contracts in the crude oil pipeline segment: (i) monthly transportation contracts and (ii) product sales contracts.

Under crude oil pipeline services monthly transportation contracts, customers submit nominations for transportation monthly and a contract is created upon the Partnership’s acceptance of the nomination under its published tariffs. Crude oil pipeline services contracts have a single performance obligation to perform the transportation service. The transportation service is provided to the customer in the same month in which the customer makes the related nomination. Revenue is recorded in the month of service and invoiced in the following month. Payment is due within 30 days. The Partnership has elected to use the right-to-invoice expedient on crude oil pipeline services contracts as the right to consideration corresponds directly with the value to the customer of performance completed to date.

The Partnership also purchases crude oil and resells to third parties under written product sales contracts. Product sales contracts have a single performance obligation, and revenue is recognized at the point in time that control is transferred to the customer. Control is considered transferred to the customer on the day of the sale. Revenue is recorded in the month of service andCustomers are invoiced in the following month. Payment is due within 30 days. The Partnership has elected to use the right-to-invoice expedient on product sales contracts as the right to consideration corresponds directly with the value to the customer of performance completed to date.

Services in the crude oil trucking segment are provided under master service agreements with customers that include rate sheets. Contracts are initiated when a customer requests service and both parties are committed upon the Partnership’s acceptance of the customer’s request. Crude oil trucking contracts have a single performance obligation to perform the service, which is completed in a day. Revenue is recorded in the month of service and invoiced in the following month. Payment is due within 30 days. The Partnership has elected to use the right-to-invoice expedient on crude oil trucking revenues as the right to consideration corresponds directly with the value to the customer of performance completed to date.

Disaggregation of Revenue

Disaggregation of revenue from contracts with customers for each operating segment by revenue type is presented as follows (in thousands):
 Three Months ended March 31, 2018 Asphalt  Terminalling Services Crude Oil Terminalling Services Crude Oil Pipeline Services Crude Oil Trucking Services Total
 Asphalt  Terminalling Services Crude Oil Terminalling Services Crude Oil Pipeline Services Crude Oil Trucking Services Total Three Months ended June 30, 2018
Third-party revenue:                    
Fixed storage, throughput and other revenue $3,549
 $4,081
 $
 $
 $7,630
 $4,622
 $2,767
 $
 $
 $7,389
Variable throughput revenue 117
 504
 
 
 621
 242
 143
 
 
 385
Variable reimbursement revenue 1,466
 
 
 
 1,466
 1,775
 
 
 
 1,775
Crude oil transportation revenue 
 
 2,061
 5,540
 7,601
 
 
 1,045
 3,509
 4,554
Crude oil product sales revenue 
 
 3,508
 6
 3,514
 
 
 45,612
 3
 45,615
Related-party revenue:                    
Fixed storage, throughput and other revenue 4,631
 
 
 
 4,631
 4,632
 
 48
 
 4,680
Variable reimbursement revenue 1,690
 
 
 
 1,690
 1,349
 
 34
 
 1,383
Total revenue from contracts with customers $11,453
 $4,585
 $5,569
 $5,546
 $27,153
 $12,620
 $2,910
 $46,739
 $3,512
 $65,781
          

 Three Months ended March 31, 2019 Asphalt  Terminalling Services Crude Oil Terminalling Services Crude Oil Pipeline Services Crude Oil Trucking Services Total
 Asphalt  Terminalling Services Crude Oil Terminalling Services Crude Oil Pipeline Services Crude Oil Trucking Services Total Six Months ended June 30, 2018
Third-party revenue:                    
Fixed storage, throughput and other revenue $4,983
 $3,069
 $
 $
 $8,052
 $8,171 $6,849
 $
 $
 $15,020
Variable throughput revenue 3
 504
 
 
 507
 359
 647
 
 
 1,006
Variable reimbursement revenue 1,996
 
 
 
 1,996
 3,241
 
 
 
 3,241
Crude oil transportation revenue 
 
 2,498
 2,833
 5,331
 
 
 3,105
 9,049
 12,154
Crude oil product sales revenue 
 
 58,924
 
 58,924
 
 
 49,120
 9
 49,129
Related-party revenue:                    
Fixed storage, throughput and other revenue 2,848
 
 83
 
 2,931
 9,263
 
 48
 
 9,311
Variable reimbursement revenue 1,270
 
 18
 
 1,288
 3,039
 
 34
 
 3,073
Total revenue from contracts with customers $11,100
 $3,573
 $61,523
 $2,833
 $79,029
 $24,073
 $7,496
 $52,307
 $9,058
 $92,934
          
 Three Months ended June 30, 2019
Third-party revenue:          
Fixed storage, throughput and other revenue 5,053
 3,377
 
 
 8,430
Variable throughput revenue 33
 643
 
 
 676
Variable reimbursement revenue 1,764
 
 
 
 1,764
Crude oil transportation revenue 
 
 1,972
 2,885
 4,857
Crude oil product sales revenue 
 
 59,636
 
 59,636
Related-party revenue:          
Fixed storage, throughput and other revenue 2,858
 
 83
 
 2,941
Variable reimbursement revenue 1,123
 
 18
 
 1,141
Total revenue from contracts with customers 10,831
 4,020
 61,709
 2,885
 79,445
          
 Six Months ended June 30, 2019
Third-party revenue:          
Fixed storage, throughput and other revenue 10,035
 6,447
 
 
 16,482
Variable throughput revenue 36
 1,147
 
 
 1,183
Variable reimbursement revenue 3,760
 
 
 
 3,760
Crude oil transportation revenue 
 
 4,470
 5,718
 10,188
Crude oil product sales revenue 
 
 118,560
 
 118,560
Related-party revenue:          
Fixed storage, throughput and other revenue 5,705
 
 167
 
 5,872
Variable reimbursement revenue 2,393
 
 36
 
 2,429
Total revenue from contracts with customers 21,929
 7,594
 123,233
 5,718
 158,474

Contract Balances

The timing of revenue recognition, billings and cash collections result in billed accounts receivable and unearned revenue (contract liabilities) on the unaudited condensed consolidated balance sheets as noted in the contract discussions above. Accounts receivable are reflected in the line items “Accounts receivable” and “Receivables from related parties” on the unaudited condensed consolidated balance sheets. Unearned revenue is included in the line items “Unearned revenue,” “Unearned revenue with related parties,” “Long-term unearned revenue with related parties” and “Other long-term liabilities” on the unaudited condensed consolidated balance sheets.

Billed accounts receivable from contracts with customers were $34.6 million and $25.8$23.8 million at December 31, 2018, and March 31,June 30, 2019, respectively.

The Partnership records unearned revenues when cash payments are received in advance of performance. Unearned revenue related to contracts with customers was $5.9 million and $10.1$6.4 million at December 31, 2018, and March 31,June 30, 2019, respectively. The change in the unearned revenue balance for the threesix months ended March 31,June 30, 2019, is driven by $7.3$3.7 million in cash payments received in advance of satisfying performance obligations, partially offset by $3.1$3.2 million of revenues recognized that were included in the unearned revenue balance at the beginning of the period.

Practical Expedients and Exemptions

The Partnership does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which revenue is recognized at the amount to which the Partnership has the right to invoice for services performed. The Partnership is using the right-to-invoice practical expedient on all contracts with customers in its crude oil terminalling services, crude oil pipeline services and crude oil trucking services segments.

4.     RESTRUCTURING CHARGES

During the fourth quarter of 2015, the Partnership recognized certain restructuring charges in its crude oil trucking services segment pursuant to an approved plan to exit the trucking market in West Texas. The restructuring charges included an accrual related to leased vehicles that were idled as part of the restructuring plan. This accrual was being amortized over the remaining lease term of the vehicles. In June 2018, the Partnership purchased the vehicles off lease and resold them to a third party, paying off the remaining liability.


Changes in the accrued amounts pertaining to the restructuring charges are summarized as follows (in thousands):
Three Months ended
March 31,
Three Months ended June 30, Six Months ended June 30,
20182018 2018
Beginning balance$286
$237
 $286
Cash payments49
237
 286
Ending balance$237
$
 $

5.    EQUITY METHOD INVESTMENT
 
The Partnership’s investment in Advantage Pipeline, L.L.C. (“Advantage Pipeline”), over which the Partnership had significant influence but not control, was accounted for by the equity method. The Partnership did not consolidate any part of the assets or liabilities of Advantage Pipeline. On April 3, 2017, Advantage Pipeline was acquired by a joint venture formed by affiliates of Plains All American Pipeline, L.P. and Noble Midstream Partners LP. The Partnership received cash proceeds at closing from the sale of its approximate 30% equity ownership interest in Advantage Pipeline of approximately $25.3 million and recorded a gain on the sale of the investment of $4.2 million. Approximately 10% of the gross sale proceeds were held in escrow, subject to certain post-closing settlement terms and conditions. The Partnership received approximately $1.1 million of the funds held in escrow in August 2017, and approximately $2.2 million for its pro rata portion of the remaining net escrow proceeds in January 2018. The Partnership’s proceeds were used to prepay revolving debt (without a commitment reduction). As of March 31,June 30, 2019, the Partnership had no equity investments.


6.    PROPERTY, PLANT AND EQUIPMENT
Estimated Useful Lives (Years) December 31, 2018 March 31,
2019
Estimated Useful Lives (Years) December 31, 2018 June 30,
2019
  
  (dollars in thousands)  (dollars in thousands)
LandN/A $24,705
 $24,705
N/A $24,705
 $24,705
Land improvements10-20 5,758
 5,798
10-20 5,758
 5,810
Pipelines and facilities5-30 116,155
 117,188
5-30 116,155
 117,448
Storage and terminal facilities10-35 321,096
 322,476
10-35 321,096
 325,247
Transportation equipment3-10 2,798
 1,782
3-10 2,798
 1,782
Office property and equipment and other3-20 26,980
 27,186
3-20 26,980
 27,244
Pipeline linefill and tank bottomsN/A 10,297
 8,882
N/A 10,297
 8,262
Construction-in-progressN/A 4,026
 3,622
N/A 4,026
 4,052
Property, plant and equipment, gross  511,815
 511,639
  511,815
 514,550
Accumulated depreciation  (263,554) (268,576)  (263,554) (273,420)
Property, plant and equipment, net  $248,261
 $243,063
  $248,261
 $241,130
 
Plant, propertyProperty, plant and equipment under operating leases at March 31,June 30, 2019, in which the Partnership is the lessor, had a cost basis of $282.1$284.9 million and accumulated depreciation of $173.3$175.7 million.

Depreciation expense for the three months ended March 31,June 30, 2018 and 2019, was $7.0$6.7 million and $6.0$5.5 million, respectively. Depreciation expense for the six months ended June 30, 2018 and 2019, was $13.7 million and $11.4 million, respectively.

During the threesix months ended March 31,June 30, 2019, the Partnership recognized asset impairment expense of $1.1$2.2 million. A change in estimate of the push-down impairment related to Cimarron Express Pipeline, LLC (“Cimarron Express”) resulted in additional impairment expense of $0.8$1.9 million. This impairment is recorded at the corporate level and the estimate is based on the expected amount due to Ergon, Inc. (“Ergon”) if the Put (as defined in Note 10) is exercised (see Note 10 for more information). In addition, a floodflooding at anseveral asphalt terminalplants in Wolcott, Kansas,the Midwest led to an impairment of $0.3 million.

During the threesix months ended March 31,June 30, 2019, the Partnership sold various surplus assets, including the sale of three truck stations for $1.6 million, which resulted in a gain of $1.5 million, and the sale of pipeline linefill for $1.6 million, which resulted in a gain of $0.2 million. In addition, proceeds received during the threesix months ended March 31,June 30, 2019, included $2.6 million related to a sale of pipeline linefill in December 2018, for which the proceeds were received in January 2019.

On July 12, 2018, the Partnership sold certain asphalt terminals, storage tanks and related real property, contracts, permits, assets and other interests located in Lubbock and Saginaw, Texas and Memphis, Tennessee (the “Divestiture”) to Ergon Asphalt & Emulsion, Inc. for a purchase price of $90.0 million, subject to customary adjustments. The Divestiture does not qualify as discontinued operations as it does not represent a strategic shift that will have a major effect on the Partnership’s operations or financial results. The Partnership used the proceeds from the sale to prepay revolving debt under its credit agreement.

In April 2018, the Partnership sold its producer field services business. The Partnership received cash proceeds at closing of approximately $3.0 million and recorded a gain of $0.4 million. The sale of the producer field services business does not qualify as discontinued operations as it does not represent a strategic shift that will have a major effect on the Partnership’s operations or financial results. The Partnership used the proceeds from the sale to prepay revolving debt under its credit agreement.

In March 2018, the Partnership acquired an asphalt terminalling facility in Oklahoma from a third party for approximately $22.0 million, consisting of property, plant and equipment of $11.5 million, intangible assets of $7.6 million and goodwill of $2.9 million.

7.    DEBT

On May 11, 2017, the Partnership entered into an amended and restated credit agreement. On June 28, 2018, the credit agreement was amended to, among other things, reduce the revolving loan facility from $450.0 million to $400.0 million and amend the maximum permitted consolidated total leverage ratio as discussed below.


As of May 6,August 1, 2019, approximately $251.6$256.6 million of revolver borrowings and $1.0 million of letters of credit were outstanding under the credit agreement, leaving the Partnership with approximately $147.4$142.4 million available capacity for additional revolver borrowings and letters of credit under the credit agreement, although the Partnership’s ability to borrow such funds may be limited by the financial covenants in the credit agreement.  The proceeds of loans made under the credit agreement may be used for working capital and other general corporate purposes of the Partnership.

The credit agreement is guaranteed by all of the Partnership’s existing subsidiaries. Obligations under the credit agreement are secured by first priority liens on substantially all of the Partnership’s assets and those of the guarantors.
 
The credit agreement includes procedures for additional financial institutions to become revolving lenders, or for any existing lender to increase its revolving commitment thereunder, subject to an aggregate maximum of $600.0 million for all revolving loan commitments under the credit agreement.
 
The credit agreement will mature on May 11, 2022, and all amounts outstanding under the credit agreement will become due and payable on such date. The credit agreement requires mandatory prepayments of amounts outstanding thereunder with the net proceeds of certain asset sales, property or casualty insurance claims and condemnation proceedings, unless the Partnership reinvests such proceeds in accordance with the credit agreement, but these mandatory prepayments will not require any reduction of the lenders’ commitments under the credit agreement.

Borrowings under the credit agreement bear interest, at the Partnership’s option, at either the reserve-adjusted eurodollar rate (as defined in the credit agreement) plus an applicable margin that ranges from 2.0% to 3.25% or the alternate base rate (the highest of the agent bank’s prime rate, the federal funds effective rate plus 0.5%, and the 30-day eurodollar rate plus 1.0%) plus an applicable margin that ranges from 1.0% to 2.25%.  The Partnership pays a per annum fee on all letters of credit issued under the credit agreement, which fee equals the applicable margin for loans accruing interest based on the eurodollar rate, and the Partnership pays a commitment fee ranging from 0.375% to 0.5% on the unused commitments under the credit agreement.  The applicable margins for the Partnership’s interest rate, the letter of credit fee and the commitment fee vary quarterly based on the Partnership’s consolidated total leverage ratio (as defined in the credit agreement, being generally computed as the ratio of consolidated total debt to consolidated earnings before interest, taxes, depreciation, amortization and certain other non-cash charges).

The credit agreement includes financial covenants that are tested on a quarterly basis, based on the rolling four-quarter period that ends on the last day of each fiscal quarter.

Prior to the date on which the Partnership issues qualified senior notes in an aggregate principal amount (when combined with all other qualified senior notes previously or concurrently issued) that equals or exceeds $200.0 million, the maximum permitted consolidated total leverage ratio will be 5.25 to 1.00 for the fiscal quartersquarter ending March 31, 2019, and June 30, 2019; 5.00 to 1.00 for the fiscal quarters ending September 30, 2019, and December 31, 2019; and 4.75 to 1.00 for the fiscal

quarter ending March 31, 2020, and each fiscal quarter thereafter; provided that the maximum permitted consolidated total leverage ratio may be increased to 5.25 to 1.00 for certain quarters after December 31, 2019, based on the occurrence of a specified acquisition (as defined in the credit agreement, but generally being an acquisition for which the aggregate consideration is $15.0 million or more).
From and after the date on which the Partnership issues qualified senior notes in an aggregate principal amount (when combined with all other qualified senior notes previously or concurrently issued) that equals or exceeds $200.0 million, the maximum permitted consolidated total leverage ratio is 5.00 to 1.00; provided that from and after the fiscal quarter ending immediately preceding the fiscal quarter in which a specified acquisition occurs to and including the last day of the second full fiscal quarter following the fiscal quarter in which such acquisition occurred, the maximum permitted consolidated total leverage ratio will be 5.50 to 1.00.

The maximum permitted consolidated senior secured leverage ratio (as defined in the credit agreement, but generally computed as the ratio of consolidated total secured debt to consolidated earnings before interest, taxes, depreciation, amortization and certain other non-cash charges) is 3.50 to 1.00, but this covenant is only tested from and after the date on which the Partnership issues qualified senior notes in an aggregate principal amount (when combined with all other qualified senior notes previously or concurrently issued) that equals or exceeds $200.0 million.

The minimum permitted consolidated interest coverage ratio (as defined in the credit agreement, but generally computed as the ratio of consolidated earnings before interest, taxes, depreciation, amortization and certain other non-cash charges (“credit agreement EBITDA”) to consolidated interest expense) is 2.50 to 1.00.

In addition, the credit agreement contains various covenants that, among other restrictions, limit the Partnership’s ability to:
create, issue, incur or assume indebtedness;
create, incur or assume liens;
engage in mergers or acquisitions;
sell, transfer, assign or convey assets;
repurchase the Partnership’s equity, make distributions to unitholders and make certain other restricted payments;
make investments;
modify the terms of certain indebtedness, or prepay certain indebtedness;
engage in transactions with affiliates;
enter into certain hedging contracts;
enter into certain burdensome agreements;
change the nature of the Partnership’s business; and
make certain amendments to the Partnership’sFourth Amended and Restated Agreement of Limited Partnership of the Partnership (the “Partnership’s partnership agreement.agreement”).

At March 31,June 30, 2019, the Partnership’s consolidated total leverage ratio was 4.644.60 to 1.00 and the consolidated interest coverage ratio was 3.423.68 to 1.00.  The Partnership was in compliance with all covenants of its credit agreement as of March 31,June 30, 2019.

Management evaluates whether conditions and/or events raise substantial doubt about the Partnership’s ability to continue as a going concern within one year after the date that the consolidated financial statements are issued (the “assessment period”). In performing this assessment, management considered the risk associated with its ongoing ability to meet the financial covenants.

Based on the Partnership’s forecasted credit agreement EBITDA during the assessment period, management believes that it will meetremain in compliance with these financial covenants (as described below). However, there are certain inherent risks associated with our continued ability to comply with our consolidated total leverage ratio covenant. These risks relate, among other things, to potential future (a) decreases in storage volumes and rates as well as throughput and transportation rates realized; (b) weather phenomenon that may potentially hinder the Partnership’s asphalt business activity; and (c) other items affecting forecasted levels of expenditures and uses of cash resources. Violation of the consolidated total leverage ratio covenant would be an event of default under the credit agreement, which would cause our $252.6$261.6 million in outstanding debt, as of March 31,June 30, 2019, to become immediately due and payable. If this were to occur, the Partnership would not expect to have sufficient liquidity to repay these outstanding amounts then due, which could cause the lenders under the credit facility to pursue other remedies. Such remedies could include exercising their collateral rights to the Partnership’s assets.


Based on management’s current forecasts, management believes the Partnership will be able to comply with the consolidated total leverage ratio during the assessment period. However, the Partnership cannot make any assurances that it will be able to achieve management’s forecasts. If the Partnership is unable to achieve management’s forecasts, further actions may be necessary to remain in compliance with the Partnership’s consolidated total leverage ratio covenant including, but not limited to, cost reductions, common and preferred unitholder distribution curtailments, and/or asset sales. The Partnership can make no assurances that it would be successful in undertaking these actions or that the Partnership will remain in compliance with the consolidated total leverage ratio during the assessment period.

The credit agreement permits the Partnership to make quarterly distributions of available cash (as defined in the Partnership’s partnership agreement) to unitholders so long as no default or event of default exists under the credit agreement on a pro forma basis after giving effect to such distribution, provided, however, commencing with the fiscal quarter ending September 30, 2018, in no event shall aggregate quarterly distributions in any individual fiscal quarter exceed $10.7 million through, and including, the fiscal quarter ending December 31, 2019. The Partnership is currently allowed to make distributions to its unitholders in accordance with this covenant; however, the Partnership will only make distributions to the extent it has sufficient cash from operations after establishment of cash reserves as determined by the Board of Directors (the “Board”) of Blueknight Energy Partners G.P., L.L.C. (the “general partner”) in accordance with the Partnership’s cash distribution policy, including the establishment of any reserves for the proper conduct of the Partnership’s business.  See Note 9 for additional information regarding distributions.

In addition to other customary events of default, the credit agreement includes an event of default if:


(i)the general partner ceases to own 100% of the Partnership’s general partner interest or ceases to control the Partnership;
(ii)Ergon ceases to own and control 50% or more of the membership interests of the general partner; or
(iii)during any period of 12 consecutive months, a majority of the members of the Board of the general partner ceases to be composed of individuals:
(A)who were members of the Board on the first day of such period;
(B)whose election or nomination to the Board was approved by individuals referred to in clause (A) above constituting at the time of such election or nomination at least a majority of the Board; or
(C)whose election or nomination to the Board was approved by individuals referred to in clauses (A) and (B) above constituting at the time of such election or nomination at least a majority of the Board, provided that any changes to the composition of individuals serving as members of the Board approved by Ergon will not cause an event of default.

If an event of default relating to bankruptcy or other insolvency events occurs with respect to the general partner or the Partnership, all indebtedness under the credit agreement will immediately become due and payable.  If any other event of default exists under the credit agreement, the lenders may accelerate the maturity of the obligations outstanding under the credit agreement and exercise other rights and remedies.  In addition, if any event of default exists under the credit agreement, the lenders may commence foreclosure or other actions against the collateral.
 
If any default occurs under the credit agreement, or if the Partnership is unable to make any of the representations and warranties in the credit agreement, the Partnership will be unable to borrow funds or to have letters of credit issued under the credit agreement. 

Upon the execution of the first amendment to its credit agreement in June 2018, the Partnership expensed $0.4 million of debt issuance costs due to the reduction in available borrowing capacity. The Partnership capitalized $0.3 million of debt issuance costs during each of the three and six months ended June 30, 2018. Debt issuance costs are being amortized over the term of the credit agreement. Interest expense related to debt issuance cost amortization for each of the three months ended March 31,June 30, 2018 and 2019, was $0.3 million. Interest expense related to debt issuance cost amortization for each of the six months ended June 30, 2018 and 2019, was $0.5 million.
  
During the three months ended March 31,June 30, 2018 and 2019, the weighted average interest rate under the Partnership’s credit agreement, excluding the $0.4 million of debt issuance costs in 2018 that were expensed as described above, was 4.96%5.39% and 6.43%6.27%, respectively, resulting in interest expense of approximately $3.94.7 million and $4.3$4.1 million, respectively. During the six months ended June 30, 2018 and 2019, the weighted average interest rate under the Partnership’s credit agreement, excluding the $0.4 million of debt issuance costs in 2018 that were expensed as described above, was 5.18% and 6.35%, respectively, resulting in interest expense of approximately $8.6 million and $8.4 million, respectively.

The Partnership is exposed to market risk for changes in interest rates related to its credit agreement. Interest rate swap agreements are sometimes used to manage a portion of the exposure related to changing interest rates by converting floating-rate debt to fixed-rate debt. As of March 31,June 30, 2019, the Partnership had no interest rate swap agreements; interest rate swap agreements with notional amounts totaling $100.0 million matured on January 28, 2019. During the three months ended March 31,June 30, 2018, the Partnership recorded swap interest income of $0.1 million. During the six months ended June 30, 2018 and 2019, the Partnership recorded swap interest expense of $0.1 million and swap interest income of less than $0.1 million respectively.for both periods. The interest rate swaps dodid not receive hedge accounting treatment under ASC 815 - Derivatives and Hedging.

The following provides information regarding the Partnership’s assets and liabilities related to its interest rate swap agreements as of the periods indicated (in thousands):
Derivatives Not Designated as Hedging Instruments Balance Sheet Location Fair Value of Derivatives
  December 31, 2018
Interest rate swap assets - current Other current assets $44

Changes in the fair value of the interest rate swaps are reflected in the unaudited condensed consolidated statements of operations as follows (in thousands):

Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Net Income on Derivatives Amount of Gain (Loss) Recognized in Net Income on Derivatives Location of Gain (Loss) Recognized in Net Income on Derivatives Amount of Gain (Loss) Recognized in Net Income on Derivatives
 Three Months ended
March 31,
 Three Months ended June 30, Six Months ended June 30,
 2018 2019 2018 2018 2019
Interest rate swaps Interest expense, net of capitalized interest $354
 $(44) Interest expense $(40) $314
 $(44)

8.    NET INCOME PER LIMITED PARTNER UNIT

For purposes of calculating earnings per unit, the excess of distributions over earnings or excess of earnings over distributions for each period are allocated to the Partnership’s general partner based on the general partner’s ownership interest at the time. The following sets forth the computation of basic and diluted net income per common unit (in thousands, except per unit data): 
Three Months ended
March 31,
Three Months ended June 30, Six Months ended June 30,
2018 20192018 2019 2018 2019
Net income$4,442
 $3,757
$1,785
 $3,356
 $6,227
 $7,113
General partner interest in net income231
 105
28
 53
 259
 158
Preferred interest in net income6,278
 6,279
6,279
 6,279
 12,557
 12,558
Net loss available to limited partners$(2,067) $(2,627)$(4,522) $(2,976) $(6,589) $(5,603)
          
Basic and diluted weighted average number of units:          
Common units40,289
 40,678
40,324
 40,715
 40,306
 40,696
Restricted and phantom units833
 769
1,133
 1,076
 983
 904
Total units41,122
 41,447
41,457
 41,791
 41,289
 41,600
          
Basic and diluted net loss per common unit$(0.05) $(0.06)$(0.11) $(0.07) $(0.16) $(0.13)

9.    PARTNERS’ CAPITAL AND DISTRIBUTIONS

On April 22,July 18, 2019, the Partnership announced that the Board approved a cash distribution of $0.17875 per outstanding Preferred Unitpreferred unit for the three months ended March 31,June 30, 2019.  The Partnership will pay this distribution on MayAugust 14, 2019, to unitholders of record as of May 3,August 2, 2019. The total distribution will be approximately $6.4 million, with approximately $6.3 million and $0.1 million paid to the Partnership’s preferred unitholders and general partner, respectively.

In addition, the Board approved a cash distribution of $0.04 per outstanding common unit for the three months ended March 31,June 30, 2019. The Partnership will pay this distribution on MayAugust 14, 2019, to unitholders of record on May 3,August 2, 2019. The total distribution will be approximately $1.7 million, with approximately $1.6 million and less than $0.1 million to be paid to the

Partnership’s common unitholders and general partner, respectively, and less than $0.1 million to be paid to holders of phantom and restricted units pursuant to awards granted under the Partnership’s Long-Term Incentive Plan.
  
10.    RELATED-PARTY TRANSACTIONS

Transactions with Ergon

The Partnership leases asphalt facilities and provides asphalt terminalling services to Ergon. For the three months ended March 31,June 30, 2018 and 2019, the Partnership recognized related-party revenues of $14.0$13.5 million and $9.1$8.8 million, respectively, for services provided to Ergon. For the six months ended June 30, 2018 and 2019, the Partnership recognized related-party revenues of $27.5 million and $17.9 million, respectively, for services provided to Ergon. As of December 31, 2018, and March 31,June 30, 2019, the Partnership had receivables from Ergon of $1.0 million and $0.9$1.1 million, respectively, net of allowance for doubtful accounts. As of December 31, 2018, and March 31,June 30, 2019, the Partnership had unearned revenues from Ergon of $6.5 million and $16.8$9.3 million, respectively.

Effective April 1, 2018, the Partnership entered into an agreement with Ergon under which the Partnership purchases crude oil in connection with its crude oil marketing operations. For the three months ended March 31,June 30, 2018 and 2019, the Partnership

made purchases of crude oil under this agreement totaling $30.5 million and $36.1 million, respectively. For the six months ended June 30, 2018 and 2019, the Partnership made purchases of crude oil under this agreement totaling $29.7 million.$30.5 million and $65.8 million, respectively. As of March 31,June 30, 2019, the Partnership had payables to Ergon related to this agreement of $11.9$10.2 million related to the MarchJune crude oil settlement cycle, and this balance was paid in full on AprilJuly 19, 2019.

The Partnership and Ergon have an agreement (the “Agreement”) that gives each party rights concerning the purchase or sale of Ergon’s interest in Cimarron Express, subject to certain terms and conditions. Cimarron Express was planned to be a new 16-inch diameter, 65-mile crude oil pipeline running from northeastern Kingfisher County, Oklahoma to the Partnership’s Cushing, Oklahoma crude oil terminal, with an originally anticipated in-service date in the second half of 2019. Ergon formed a Delaware limited liability company, Ergon - Oklahoma Pipeline, LLC (“DEVCO”), which holds Ergon’s 50% membership interest in Cimarron Express. Under the Agreement, the Partnership has the right, at any time, to purchase 100% of the authorized and outstanding member interests in DEVCO from Ergon for the Purchase Price (as defined in the Agreement), which shall be computed by taking Ergon’s total investment in the Cimarron Express plus interest, by giving written notice to Ergon (the “Call”). Ergon has the right to require the Partnership to purchase 100% of the authorized and outstanding member interests of DEVCO for the Purchase Price (the “Put”) at any time beginning the earlier of (i) 18 months from the formation, May 9, 2018, of the joint venture company to build the pipeline, (ii) six months after completion of the pipeline, or (iii) the event of dissolution of Cimarron Express. Upon exercise of the Call or the Put, the Partnership and Ergon will execute the Member Interest Purchase Agreement, which is attached to the Agreement as Exhibit B. Upon receipt of the Purchase Price, Ergon shall be obligated to convey 100% of the authorized and outstanding member interests in DEVCO to the Partnership or its designee. As of March 31,June 30, 2019, neither Ergon nor the Partnership has exercised their options under the Agreement.

In December 2018, the Partnership and Ergon were informed that Kingfisher Midstream made the decision to suspend future investments in Cimarron Express as Kingfisher Midstream determined that the anticipated volumes from the currently dedicated acreage, and the resultant project economics, did not support additional investment from Kingfisher Midstream. As of December 31, 2018, Cimarron Express had spent approximately $30.6 million on the pipeline project, primarily related to the purchase of steel pipe and equipment, rights of way and engineering and design services. Cimarron Express recorded a $20.9 million impairment charge in the fourth quarter of 2018 to reduce the carrying amount of its assets to their estimated fair value. In addition to its capital contributions to Cimarron Express, Ergon’s interest in DEVCO includes internal Ergon labor and capitalized interest that bring its investment in DEVCO to approximately $17.8 million through March 31, 2019. Ergon recorded a $10.0 million other-than-temporary impairment on its investment in Cimarron Express as of December 31, 2018, to reduce its investment to its estimated fair value. As a result, the Partnership considered the SEC staff’s opinions outlined in SAB 107 Topic 5.T Accounting for Expenses or Liabilities Paid by Principal Stockholders. The Agreement was designed to have the Partnership, ultimately and from the onset, bear any risk of loss on the construction of the pipeline project and eventually own a 50% interest in the pipeline. As a result, the Partnership recorded on a push downpush-down basis a $10.0 million impairment of Ergon’s investment in Cimarron Express in its consolidated results of operations during the year ended December 31, 2018, and a contingent liability payable to Ergon as of December 31, 2018. In April 2019, certain assets from the project were sold to a third-partythird party for approximately $1.4 million over the fair market value that was estimated at December 31, 2018. As a result,2018, and the Partnership will record in April 2019,recorded its share, on a push downpush-down basis, a gain on the sale based on Ergon’s 50% interest in the assets. Ergon’s interest in DEVCO includes its capital contributions, its share of the cash received for the assets sale discussed above, internal Ergon labor costs and capitalized interest, which brings its investment in DEVCO to approximately $10.7 million through June 30, 2019. During the six months ended June 30, 2019, a change in estimate and accrued interest resulted in the Partnership recording additional impairment expense of $1.9 million. The Partnership’s contingent liability as of June 30, 2019, consists of Ergon’s $10.7 million investment plus accrued interest of $1.3 million, of which $0.4 million of interest relates to the three months ended June 30, 2019.


11.    LONG-TERM INCENTIVE PLAN

In July 2007, the general partner adopted the Long-Term Incentive Plan (the “LTIP”), which is administered by the compensation committee of the Board. Effective April 29, 2014, the Partnership’s unitholders approved an amendment to the LTIP to increase the number of common units reserved for issuance under the incentive plan to 4,100,000 common units, subject to adjustments for certain events.  Although other types of awards are contemplated under the LTIP, currently outstanding awards include “phantom” units, which convey the right to receive common units upon vesting, and “restricted” units, which are grants of common units restricted until the time of vesting. The phantom unit awards also include distribution equivalent rights (“DERs”).
 
Subject to applicable earning criteria, a DER entitles the grantee to a cash payment equal to the cash distribution paid on an outstanding common unit prior to the vesting date of the underlying award. Recipients of restricted and phantom units are entitled to receive cash distributions paid on common units during the vesting period which are reflected initially as a reduction of partners’ capital. Distributions paid on units which ultimately do not vest are reclassified as compensation expense.  Awards granted to date are equity awards and, accordingly, the fair value of the awards as of the grant date is expensed over the vesting period.  


In connection with each anniversary of joining the Board, restricted common units are granted to the independent directors. The units vest in one-third increments over three years. The following table includes information on outstanding grants made to the directors under the LTIP:
Grant DateNumber of Units 
Weighted Average Grant Date Fair Value(1)
 Grant Date Total Fair Value
(in thousands)
December 201610,950
 $6.85
 $75
December 201715,306
 $4.85
 $74
December 201823,436
 $1.20
 $28
_________________
(1)    Fair value is the closing market price on the grant date of the awards.

In addition, the independent directors received common unit grants that have no vesting requirement as part of their compensation. The following table includes information on grants made to the directors under the LTIP that have no vesting requirement:
Grant DateNumber of Units 
Weighted Average Grant Date Fair Value(1)
 Grant Date Total Fair Value
(in thousands)
December 201610,220
 $6.85
 $70
December 201714,286
 $4.85
 $69
December 201821,875
 $1.20
 $26
_________________
(1)    Fair value is the closing market price on the grant date of the awards.

The Partnership also grants phantom units to employees. These grants are equity awards under ASC 718 – Stock Compensation and, accordingly, the fair value of the awards as of the grant date is expensed over the three-year vesting period. The following table includes information on the outstanding grants:
Grant DateNumber of Units 
Weighted Average Grant Date Fair Value(1)
 Grant Date Total Fair ValueNumber of Units 
Weighted Average Grant Date Fair Value(1)
 Grant Date Total Fair Value
(in thousands)
March 2017323,339
 $7.15
 $2,312
323,339
 $7.15
 $2,312
March 2018457,984
 $4.77
 $2,185
457,984
 $4.77
 $2,185
March 2019524,997
 $1.14
 $598
524,997
 $1.14
 $598
June 201946,168
 $1.08
 $50
_________________
(1)    Fair value is the closing market price on the grant date of the awards.


The unrecognized estimated compensation cost of outstanding phantom and restricted units at March 31,June 30, 2019, was $1.71.4 million, which will be expensed over the remaining vesting period.

The Partnership’s equity-based incentive compensation expense for the three months ended March 31,June 30, 2018 and 2019, was $0.5$0.6 million and $0.3 million, respectively. The Partnership’s equity-based incentive compensation expense for the six months ended June 30, 2018 and 2019, was $1.1 million and $0.6 million, respectively.

Activity pertaining to phantom and restricted common unit awards granted under the LTIP is as follows: 
Number of Units Weighted Average Grant Date Fair ValueNumber of Units Weighted Average Grant Date Fair Value
Nonvested at December 31, 2018998,219
 $5.88
998,219
 $5.88
Granted524,997
 1.14
571,165
 1.14
Vested366,282
 4.80
366,282
 4.80
Forfeited
 
69,624
 3.24
Nonvested at March 31, 20191,156,934
 $3.60
Nonvested at June 30, 20191,133,478
 $3.52

12.    EMPLOYEE BENEFIT PLANS

Under the Partnership’s 401(k) Plan, which was instituted in 2009,, employees who meet specified service requirements may contribute a percentage of their total compensation, up to a specified maximum, to the 401(k) Plan. The Partnership may match each employee’s contribution, up to a specified maximum, in full or on a partial basis. The Partnership recognized expense of $0.3 million for each of the three months ended March 31,June 30, 2018 and 2019, for discretionary contributions under the 401(k) Plan. The Partnership recognized expense of $0.6 million for each of the six months ended June 30, 2018 and 2019, for discretionary contributions under the 401(k) Plan.

The Partnership may also make annual lump-sum contributions to the 401(k) Plan irrespective of the employee’s contribution match. The Partnership may make a discretionary annual contribution in the form of profit sharing calculated as a percentage of an employee’s eligible compensation. This contribution is retirement income under the qualified 401(k) Plan. Annual profit sharing contributions to the 401(k) Plan are submitted to and approved by the Board. The Partnership recognized expense of less than $0.1 million and $0.2$0.1 million for the three months ended March 31,June 30, 2018 and 2019, respectively, for discretionary profit sharing contributions under the 401(k) Plan. The Partnership recognized expense of $0.1 million and $0.3 million for the six months ended June 30, 2018 and 2019, respectively, for discretionary profit sharing contributions under the 401(k) Plan.

Under the Partnership’s Employee Unit Purchase Plan (the “Unit Purchase Plan”), which was instituted in January 2015, employees have the opportunity to acquire or increase their ownership of common units representing limited partner interests in the Partnership. Eligible employees who enroll in the Unit Purchase Plan may elect to have a designated whole percentage, up to a specified maximum, of their eligible compensation for each pay period withheld for the purchase of common units at a discount to the then current market value. A maximum of 1,000,000 common units may be delivered under the Unit Purchase Plan, subject to adjustment for a recapitalization, split, reorganization, or similar event pursuant to the terms of the Unit Purchase Plan. The Partnership recognized compensation expense of less than $0.1 million for the each of the three and six months ended March 31,June 30, 2018 and 2019, in connection with the Unit Purchase Plan.
 
13.    FAIR VALUE MEASUREMENTS
 
The Partnership uses valuation techniques, such as the market approach (comparable market prices), the income approach (present value of future income or cash flow), and the cost approach (cost to replace the service capacity of an asset or replacement cost) to value assets and liabilities required to be measured at fair value, as appropriate. The Partnership uses an exit price when determining the fair value. The exit price represents amounts that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants.
 
The Partnership utilizes a three-tier fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The following is a brief description of those three levels:
Level 1Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.
Level 2Inputs other than quoted prices that are observable for these assets or liabilities, either directly or indirectly.  These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3Unobservable inputs in which there is little market data, which requires the reporting entity to develop its own assumptions.
 
This hierarchy requires the use of observable market data, when available, to minimize the use of unobservable inputs when determining fair value.  In periods in which they occur, the Partnership recognizes transfers into and out of Level 3 as of the end of the reporting period. There were no transfers during the threesix months ended March 31,June 30, 2019. Transfers out of Level 3 represent existing assets and liabilities that were classified previously as Level 3 for which the observable inputs became a more significant portion of the fair value estimates. Determining the appropriate classification of the Partnership’s fair value measurements within the fair value hierarchy requires management’s judgment regarding the degree to which market data is observable or corroborated by observable market data.


The Partnership’s recurring financial assets and liabilities subject to fair value measurements and the necessary disclosures are as follows (in thousands): 
 Fair Value Measurements as of December 31, 2018
DescriptionTotal 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
  (Level 3)
Assets:       
Interest rate swap assets$44
 $
 $44
 $
Total swap assets$44
 $
 $44
 $

As of March 31,June 30, 2019, the Partnership had no interest rate swap agreements.

Fair Value of Other Financial Instruments

The following disclosure of the estimated fair value of financial instruments is made in accordance with accounting guidance for financial instruments. The Partnership has determined the estimated fair values by using available market information and valuation methodologies. Considerable judgment is required in interpreting market data to develop the estimates of fair value. The use of different market assumptions or valuation methodologies may have a material effect on the estimated fair value amounts.
 
At March 31,June 30, 2019, the carrying values on the unaudited condensed consolidated balance sheets for cash and cash equivalents (classified as Level 1), accounts receivable, and accounts payable approximate their fair value because of their short-term nature.
 
Based on the borrowing rates currently available to the Partnership for credit agreement debt with similar terms and maturities and consideration of the Partnership’s non-performance risk, long-term debt associated with the Partnership’s credit agreement at March 31,June 30, 2019, approximates its fair value. The fair value of the Partnership’s long-term debt was calculated using observable inputs (LIBOR for the risk-free component) and unobservable company-specific credit spread information.   As such, the Partnership considers this debt to be Level 3.

14.    LEASES

The Partnership adopted ASU 2016-02, Leases (Topic 842) as of January 1, 2019, using the modified retrospective approach applied at the beginning of the period of adoption. The Partnership elected the package of practical expedients permitted under the transition guidance within the new standard, which, among other things, allowed it to carry forward the historical lease classification.

Adoption of the new standard resulted in the recording of additional net right of use operating lease assets and operating lease liabilities of approximately $11.8 million and $11.9 million, respectively, as of January 1, 2019. The standard did not materially impact the consolidated statement of operations and had no impact on cash flows.

The Partnership leases certain office space, land and equipment. Leases with an initial term of 12 months or less are not recorded on the balance sheet; lease expense for these leases is recognized as paid over the lease term. For real property leases, the Partnership has elected the practical expedient to not separate nonlease components (e.g., common-area maintenance costs)

from lease components and to instead account for each component as a single lease component. For leases that do not contain an implicit interest rate, the Partnership uses its most recent incremental borrowing rate.

Some real property and equipment leases contain options to renew, with renewal terms that can extend indefinitely. The exercise of such lease renewal options is at the Partnership’s sole discretion. Certain equipment leases also contain purchase options and residual value guarantees. The Partnership determines the lease term at the lease commencement date as the non-cancellable period of the lease, including options to extend or terminate the lease when such an option is reasonably certain to be exercised. The Partnership uses various data to analyze these options, including historical trends, current expectations and useful lives of assets related to the lease.

  As of  As of
Classification March 31, 2019Classification June 30, 2019
  (thousands)  (thousands)
Assets    
Operating lease assetsOperating lease assets $11,594
Operating lease assets $12,009
Finance lease assetsOther noncurrent assets 631
Other noncurrent assets 753
Total leased assets $12,225
 $12,762
Liabilities    
Current    
Operating lease liabilities
Current operating lease liability

 $2,768
Current operating lease liability

 $2,682
Finance lease liabilitiesOther current liabilities 263
Other current liabilities 276
Noncurrent    
Operating lease liabilitiesNoncurrent operating lease liability 8,935
Noncurrent operating lease liability 9,402
Finance lease liabilitiesOther long-term liabilities 368
Other long-term liabilities 448
Total lease liabilities $12,334
 $12,808

Future commitments, including options to extend lease terms that are reasonably certain of being exercised, related to leases at March 31,June 30, 2019, are summarized below (in thousands):
 Operating Leases Financing Leases
Twelve months ending March 31, 2020$2,993
 $285
Twelve months ending March 31, 20212,447
 215
Twelve months ending March 31, 20221,843
 129
Twelve months ending March 31, 20231,413
 42
Twelve months ending March 31, 20241,199
 
Thereafter5,208
 
Total15,103
 671
Less: Interest3,400
 40
Present value of lease liabilities$11,703
 $631
 Operating Leases Financing Leases
Twelve months ending June 30, 2020$2,885
 $304
Twelve months ending June 30, 20212,475
 263
Twelve months ending June 30, 20221,737
 171
Twelve months ending June 30, 20231,480
 35
Twelve months ending June 30, 20241,123
 3
Thereafter6,402
 
Total16,102
 776
Less: Interest4,018
 52
Present value of lease liabilities$12,084
 $724

Future non-cancellable commitments related to operating leases at December 31, 2018, are summarized below (in thousands):  
 Operating Leases
Year ending December 31, 2019$2,862
Year ending December 31, 20201,904
Year ending December 31, 20211,242
Year ending December 31, 2022640
Year ending December 31, 2023548
Thereafter1,259
Total future minimum lease payments$8,455


The following table summarizes the Partnership’s total lease cost by type as well as cash flow information (in thousands):
 Three Months ended
March 31,
 Three Months ended June 30, Six Months ended June 30,
Classification 2019Classification 2019 2019
Total Lease Cost by Type:        
Operating lease cost(1)
Operating Expenses $1,142
Operating Expense $1,054
 $2,196
Finance lease cost      
Amortization of leased assetsOperating Expenses 70
Operating Expense 81
 151
Interest on lease liabilitiesInterest Expense 7
Interest Expense 10
 17
Net lease cost $1,219
 $1,145
 $2,364
Supplemental cash flow disclosures:      
Cash paid for amounts included in the measurement of lease liabilities:

      
Operating cash flows from operating leases

 $(750)   $(1,444)
Operating cash flows from finance leases

 $(12)   $(70)
Financing cash flows from finance leases

 $(66)   $(145)
Leased assets obtained in exchange for new operating lease liabilities
 $569
   $1,678
Leased assets obtained in exchange for new finance lease liabilities

 $112
   $342
____________________
(1)    Includes short-term leases and variable lease costs, which are immaterial.
  As of
  March 31,June 30, 2019
Lease Term and Discount Rate  
Weighted-average remaining lease term (years)  
Operating leases 9.09.6
Finance leases 2.8
Weighted-average discount rate  
Operating leases 5.655.73%
Finance leases 4.204.64%

The Partnership also incurs costs associated with acquiring and maintaining rights-of-way. The contracts for these generally either extend beyond one year but can be cancelled at any time should they no longer be required for operations or have no contracted term but contain perpetual annual or monthly renewal options. Rights-of-way generally do not provide for exclusive use of the land and as such are not accounted for as leases.

15.    OPERATING SEGMENTS

The Partnership’s operations consist of four reportable segments: (i) asphalt terminalling services, (ii) crude oil terminalling services, (iii) crude oil pipeline services and (iv) crude oil trucking services.  
 
ASPHALT TERMINALLING SERVICES —The Partnership provides asphalt product and residual fuel terminalling services, including storage, blending, processing and throughput services. On July 12, 2018, the Partnership sold three asphalt facilities. See Note 6 for additional information. The Partnership has 53 terminalling facilities located in 26 states.

CRUDE OIL TERMINALLING SERVICES —The Partnership provides crude oil terminalling services at its terminalling facility located in Oklahoma.

CRUDE OIL PIPELINE SERVICES —The Partnership owns and operates pipeline systems that gather crude oil purchased by its customers and transports it to refiners, to common carrier pipelines for ultimate delivery to refiners or to terminalling facilities owned by the Partnership and others. The Partnership refers to its pipeline system located in Oklahoma and the Texas Panhandle as the Mid-Continent pipeline system. Crude oil product sales revenues consist of sales proceeds recognized for the sale of crude oil to third-party customers.
 

CRUDE OIL TRUCKING SERVICES — The Partnership uses its owned and leased tanker trucks to gather crude oil for its customers at remote wellhead locations generally not covered by pipeline and gathering systems and to transport the crude oil to aggregation points and storage facilities located along pipeline gathering and transportation systems.  
 
The Partnership’s management evaluates segment performance based upon operating margin, excluding amortization and depreciation, which includes revenues from related parties and external customers and operating expense, excluding depreciation and amortization. Operating margin, excluding depreciation and amortization (in the aggregate and by segment) is presented in the following table. The Partnership computes the components of operating margin, excluding depreciation and amortization by using amounts that are determined in accordance with GAAP. The Partnership accounts for intersegment product sales as if the sales were to third parties, that is, at current market prices. A reconciliation of operating margin, excluding depreciation and amortization to income before income taxes, which is its nearest comparable GAAP financial measure, is included in the following table. The Partnership believes that investors benefit from having access to the same financial measures being utilized by management. Operating margin, excluding depreciation and amortization is an important measure of the economic performance of the Partnership’s core operations. This measure forms the basis of the Partnership’s internal financial reporting and is used by its management in deciding how to allocate capital resources among segments. Income before income taxes, alternatively, includes expense items, such as depreciation and amortization, general and administrative expenses and interest expense, which management does not consider when evaluating the core profitability of the Partnership’s operations.

The following table reflects certain financial data for each segment for the periods indicated (in thousands):
 Three Months ended
March 31,
 Three Months ended June 30, Six Months ended June 30,
 2018 2019 2018 2019 2018 2019
Asphalt Terminalling Services            
Service revenue:            
Third-party revenue $5,132
 $6,982
 $6,639
 $6,850
 $11,771
 $13,831
Related-party revenue 6,321
 4,118
 5,981
 3,981
 12,302
 8,098
Lease revenue:            
Third-party revenue 9,458
 9,763
 10,016
 9,819
 19,473
 19,582
Related-party revenue 7,702
 4,940
 7,475
 4,812
 15,178
 9,752
Total revenue for reportable segment 28,613
 25,803
 30,111
 25,462
 58,724
 51,263
Operating expense, excluding depreciation and amortization 13,333
 12,285
 13,393
 11,670
 26,728
 23,955
Operating margin, excluding depreciation and amortization $15,280
 $13,518
 $16,718
 $13,792
 $31,996
 $27,308
Total assets (end of period) $170,473
 $147,844
 $167,849
 $149,603
 $167,849
 $149,603
            
Crude Oil Terminalling Services        
    
Service revenue:        
    
Third-party revenue $4,585
 $3,573
 $2,910
 $4,020
 $7,496
 $7,594
Intersegment revenue 
 298
 170
 278
 170
 576
Lease revenue:            
Third-party revenue 15
 
 12
 
 27
 
Total revenue for reportable segment 4,600
 3,871
 3,092
 4,298
 7,693
 8,170
Operating expense, excluding depreciation and amortization 1,275
 1,282
 913
 1,017
 2,188
 2,299
Operating margin, excluding depreciation and amortization $3,325
 $2,589
 $2,179
 $3,281
 $5,505
 $5,871
Total assets (end of period) $68,160
 $67,934
 $67,150
 $67,272
 $67,150
 $67,272
            

 Three Months ended
March 31,
 Three Months ended June 30, Six Months ended June 30,
 2018 2019 2018 2019 2018 2019
Crude Oil Pipeline Services        
    
Service revenue:        
    
Third-party revenue $2,061
 $2,498
 $1,045
 $1,972
 $3,105
 $4,470
Related-party revenue 
 101
 82
 101
 82
 203
Lease revenue:            
Third-party revenue 235
 
 177
 
 412
 
Product sales revenue:            
Third-party revenue 3,508
 58,924
 45,612
 59,636
 49,120
 118,560
Total revenue for reportable segment 5,804
 61,523
 46,916
 61,709
 52,719
 123,233
Operating expense, excluding depreciation and amortization 2,785
 2,722
 2,542
 2,749
 5,327
 5,471
Intersegment operating expense 442
 1,627
 1,156
 1,704
 1,599
 3,331
Third-party cost of product sales 2,637
 24,587
 20,041
 20,510
 22,678
 45,097
Related-party cost of product sales 
 30,774
 23,747
 36,421
 23,747
 67,195
Operating margin, excluding depreciation and amortization $(60) $1,813
 $(570) $325
 $(632) $2,139
Total assets (end of period) $116,845
 $98,722
 $152,105
 $94,436
 $152,105
 $94,436
            
Crude Oil Trucking Services        
    
Service revenue        
    
Third-party revenue $5,540
 $2,833
 $3,509
 $2,885
 $9,049
 $5,718
Intersegment revenue 442
 1,329
 986
 1,426
 1,429
 2,755
Lease revenue:            
Third-party revenue 97
 
 32
 
 129
 
Product sales revenue:            
Third-party revenue 6
 
 3
 
 9
 
Total revenue for reportable segment 6,085
 4,162
 4,530
 4,311
 10,616
 8,473
Operating expense, excluding depreciation and amortization 6,375
 4,220
 4,727
 4,242
 11,101
 8,462
Operating margin, excluding depreciation and amortization $(290) $(58) $(197) $69
 $(485) $11
Total assets (end of period) $6,113
 $5,156
 $3,402
 $4,951
 $3,402
 $4,951
            
Total operating margin, excluding depreciation and amortization(1)
 $18,255
 $17,862
 $18,130
 $17,467
 $36,384
 $35,329
            
Total Segment Revenues $45,102
 $95,359
 $84,649
 $95,780
 $129,752
 $191,139
Elimination of Intersegment Revenues (442) (1,627) (1,156) (1,704) (1,599) (3,331)
Consolidated Revenues $44,660
 $93,732
 $83,493
 $94,076
 $128,153
 $187,808

____________________
(1)The following table reconciles segment operating margin (excluding depreciation and amortization) to income before income taxes (in thousands):
Three Months ended
March 31,
Three Months ended June 30, Six Months ended June 30,
2018 20192018 2019 2018 2019
Operating margin, excluding depreciation and amortization$18,255
 $17,862
$18,130
 $17,467
 $36,384
 $35,329
Depreciation and amortization(7,367) (6,734)(7,413) (6,237) (14,779) (12,971)
General and administrative expense(4,221) (3,693)(4,486) (2,962) (8,707) (6,655)
Asset impairment expense(616) (1,119)
 (1,114) (616) (2,233)
Gain (loss) on sale of assets(236) 1,724
Gain on sale of assets599
 81
 363
 1,805
Other income
 268
 
 268
Gain on sale of unconsolidated affiliate
 
 2,225
 
Interest expense(3,569) (4,271)(5,024) (4,134) (8,593) (8,405)
Gain on sale of unconsolidated affiliate2,225
 
Income before income taxes$4,471
 $3,769
$1,806
 $3,369
 $6,277
 $7,138

16.    COMMITMENTS AND CONTINGENCIES

The Partnership is from time to time subject to various legal actions and claims incidental to its business. Management believes that these legal proceedings will not have a material adverse effect on the financial position, results of operations or cash flows of the Partnership. Once management determines that information pertaining to a legal proceeding indicates that it is probable that a liability has been incurred and the amount of such liability can be reasonably estimated, an accrual is established equal to its estimate of the likely exposure.
  
The Partnership has contractual obligations to perform dismantlement and removal activities in the event that some of its asphalt product and residual fuel oil terminalling and storage assets are abandoned. These obligations include varying levels of activity including completely removing the assets and returning the land to its original state. The Partnership has determined that the settlement dates related to the retirement obligations are indeterminate. The assets with indeterminate settlement dates have been in existence for many years and with regular maintenance will continue to be in service for many years to come. Also, it is not possible to predict when demands for the Partnership’s terminalling and storage services will cease, and the Partnership does not believe that such demand will cease for the foreseeable future.  Accordingly, the Partnership believes the date when these assets will be abandoned is indeterminate. With no reasonably determinable abandonment date, the Partnership cannot reasonably estimate the fair value of the associated asset retirement obligations.  Management believes that if the Partnership’s asset retirement obligations were settled in the foreseeable future the present value of potential cash flows that
would be required to settle the obligations based on current costs are not material.  The Partnership will record asset retirement obligations for these assets in the period in which sufficient information becomes available for it to reasonably determine the settlement dates.

17.    INCOME TAXES

In relation to the Partnership’s taxable subsidiary, the tax effects of temporary differences between the tax basis of assets and liabilities and their financial reporting amounts at March 31,June 30, 2019, are presented below (dollars in thousands):
 
Deferred Tax Asset  
Difference in bases of property, plant and equipment$260
$245
Net operating loss carryforwards7
18
Deferred tax asset267
263
Less: valuation allowance267
263
Net deferred tax asset$
$
 
The Partnership has considered the taxable income projections in future years, whether future revenue and operating cost projections will produce enough taxable income to realize the deferred tax asset based on existing service rates and cost structures and the Partnership’s earnings history exclusive of the loss that created the future deductible amount for the Partnership’s subsidiary that is taxed as a corporation for purposes of determining the likelihood of realizing the benefits of the

deferred tax assets. As a result of the Partnership’s consideration of these factors, the Partnership has provided a valuation allowance against its deferred tax asset as of March 31,June 30, 2019.


18.    RECENTLY ISSUED ACCOUNTING STANDARDS

Except as discussed below and in the 2018 Form 10-K, there have been no new accounting pronouncements that have become effective or have been issued during the threesix months ended March 31,June 30, 2019, that are of significance or potential significance to the Partnership.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)”. This is a comprehensive update to the lease accounting topic in the Codification intended to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The amendments in ASU 2016-02 include a revised definition of a lease as well as certain scope exceptions. The changes primarily impact lessee accounting, while lessor accounting is largely unchanged from previous GAAP. The Partnership adopted this standard as of January 1, 2019, using the modified retrospective approach. See Note 3 and Note 14 for disclosures related to the adoption of this standard and the impact on the Partnership’s financial position, results of operations and cash flows.

19.    SUBSEQUENT EVENTS

On August 5, 2019, Ergon publicly announced that it submitted to the Board a non-binding proposal, pursuant to which Ergon would acquire all common units and preferred units of the Partnership that Ergon and its affiliates do not already own in exchange for $1.35 per common unit and $5.67 per preferred unit. The transaction, as proposed, is subject to a number of contingencies, including the approval of the Conflicts Committee of the Board, the approval by the Partnership’s unitholders and the satisfaction of any conditions to the consummation of a transaction set forth in any definitive agreement concerning the transaction. There can be no assurance that definitive agreement will be executed or that any transaction will materialize.

Item 2.    Management’s Discussion and Analysis of Financial Condition and Results of Operations.
  
As used in this quarterly report, unless we indicate otherwise: (1) “Blueknight Energy Partners,” “our,” “we,” “us” and similar terms refer to Blueknight Energy Partners, L.P., together with its subsidiaries, (2) our “General Partner” refers to Blueknight Energy Partners G.P., L.L.C., (3) “Ergon” refers to Ergon, Inc., its affiliates and subsidiaries (other than our General Partner and us) and (4) “Vitol” refers to Vitol Holding B.V., its affiliates and subsidiaries.  The following discussion analyzes the historical financial condition and results of operations of the Partnership and should be read in conjunction with our financial statements and notes thereto, and Management’s Discussion and Analysis of Financial Condition and Results of Operations presented in our Annual Report on Form 10-K for the year ended December 31, 2018, which was filed with the Securities and Exchange Commission (the “SEC”) on March 12, 2019 (the “2018 Form 10-K”). 

Forward-Looking Statements
 
This report contains forward-looking statements.  Statements included in this quarterly report that are not historical facts (including any statements regarding plans and objectives of management for future operations or economic performance, or assumptions or forecasts related thereto), including, without limitation, the information set forth in this Management’s Discussion and Analysis of Financial Condition and Results of Operations, are forward-looking statements. These statements can be identified by the use of forward-looking terminology including “may,” “will,” “should,” “believe,” “expect,” “intend,”

“anticipate, “anticipate,” “estimate,” “continue,” or other similar words. These statements discuss future expectations, contain projections of results of operations or of financial condition, or state other “forward-looking” information. We and our representatives may from time to time make other oral or written statements that are also forward-looking statements.
 
Such forward-looking statements are subject to various risks and uncertainties that could cause actual results to differ materially from those anticipated as of the date of the filing of this report. Although we believe that the expectations reflected in these forward-looking statements are based on reasonable assumptions, no assurance can be given that these expectations will prove to be correct. Important factors that could cause our actual results to differ materially from the expectations reflected in these forward-looking statements include, among other things, those set forth in “Part I, Item 1A. Risk Factors” in the 2018 Form 10-K.
 
All forward-looking statements included in this report are based on information available to us on the date of this report. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise. All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by the cautionary statements contained throughout this report.

Overview
 
We are a publicly traded master limited partnership with operations in 27 states. We provide integrated terminalling, gathering and transportation services for companies engaged in the production, distribution and marketing of liquid asphalt and crude oil.  We manage our operations through four operating segments: (i) asphalt terminalling services, (ii) crude oil terminalling services, (iii) crude oil pipeline services and (iv) crude oil trucking services.

Potential Impact of Crude Oil Market Price Changes and Other Matters on Future Revenues

The crude oil market price and the corresponding forward market pricing curve may fluctuate significantly from period to period. In addition, volatility in the overall energy industry and specifically in publicly traded midstream energy partnerships

may impact our partnership in the near term. Factors include the overall market price for crude oil and whether or not the forward price curve is in contango (in which future prices are higher than current prices and a premium is placed on storing product and selling at a later time) or backwardated (in which the current crude oil price per barrel is higher than the future price per barrel and a premium is placed on delivering product to market and selling as soon as possible), changes in crude oil production volume and the demand for storage and transportation capacity in the areas in which we serve, geopolitical concerns and overall changes in our cost of capital. As of May 6,August 1, 2019, the forward price curve is in a shallow contango. Potential impacts of these factors are discussed below.

Asphalt Terminalling Services - AlthoughHistorically, there is nohas only been limited times in which asphalt prices and volumes have had a direct correlation betweenwith the price of crude oil and the price of asphalt, the asphalt industry tends to benefit from a lower crude oil price environment, a strong economy and an increase in infrastructure spending.oil. As a result, we do not expect thethat changes in the price of crude oil to significantlywill necessarily have a significant impact our asphalt terminalling services operating segment. We haveGenerally, asphalt volumes correlate more closely with the strength of state and local economies, level of allocations of tax funding to transportation spending and an increase in infrastructure spending needs.
In early 2019, we received positive feedback from customers that they arewere generally expecting improved throughput volumes through our terminals in 2019; however,2019. However, since it is early ina significant portion of the asphalt season remains, we cannot be certain of the level of those throughput volumes or the impact that weather may have on customers’ construction or paving projects throughout the year.

In Marchaddition, during the first half of 2019, several of our Wolcott, Kansas, asphalt facility wasfacilities in the Midwest were damaged by flooding of the Missouri River.flooding. While the facility wasfacilities were able to successfully execute its flood planplans to minimize damages, costs related to the floodfloods are expected to include $0.2$0.4 million of maintenance operating expenses for cleanup and the removal and reinstallation of equipment and $0.3$2.2 million of maintenance capital expenses for repairsexpenditures to restore land improvements and tank insulation.equipment. For the six months ended June 30, 2019, approximately $0.5 million of these amounts have been spent. Impairment expense related to the assets was approximately $0.3 million. In addition,Related to the first quarter flood event, we expect a losshave recognized $0.4 million of revenue of approximately $0.2 million forinsurance recoveries. Regarding the period of time in which the facility was shut down. Whilesecond quarter flood events, while we are pursuing insurance claims for this event,these events, there can be no assurance of the amount or timing of any proceeds we may receive under such claims.

On July 12, 2018, we sold certain asphalt terminals, storage tanks and related real property, contracts, permits, assets and other interests located in Lubbock and Saginaw, Texas and Memphis, Tennessee (the “Divestiture”) to Ergon for a purchase price of $90.0 million, subject to customary adjustments.

Crude Oil Terminalling Services - A contango crude oil curve tends to favor the crude oil storage business as crude oil marketers are incentivized to store crude oil during the current month and sell into the future month. Since March 2016, the crude oil curve has generally been in a shallow contango or backwardation. In these shallow contango or backwardated markets there is no clear incentive for marketers to store crude oil. A shallow contango or a backwardated market may impact

our ability to re-contract expiring contracts and/or decrease the storage rate at which we are able to re-contract. Alternatively, despite a shallow contango curve, we have seen increased activity and interests from customers that are regularly turning over their volumes by blending various crude grades and delivering it out of the terminal or customers utilizing the storage for more operational purposes for their downstream operations. As a result of the current shallow contango and overallthis change in demand factors for Cushing storage, we anticipate that we will continue to experience a challengingmore complex recontracting environment which may impacthas the potential to affect both the volumevolumes and rate of storage we are able to successfully recontract and the rate at which we recontract.our recontracting efforts.

Crude Oil Pipeline Services - A backwardated crude oil curve tends to favor the crude oil pipeline transportation business as crude oil marketers are incentivized to transport crude oil to market for sale as soon as possible. However, our crude oil pipeline services business has been impacted recently by an out-of-service pipeline. Betweenfrom April 2016 andto July 2018, we had beenwere operating one Oklahoma pipeline system instead of two systems providing us with a capacity of approximately 20,000due to 25,000 barrels per day (Bpd).an out-of-service pipeline. In July 2018, we were able to restore service to a secondthe Eagle pipeline system which has increased the transportation capacity of our pipeline systems by approximately 20,000 Bpd. The ability to fully utilize the capacity of these systems may be impacted by the market price of crude oil and producers’ decisions to increase or decrease production in the areas we serve.

Over the past year, we increased the volumes of crude oil transported for our internal crude oil marketing operations with the objective of increasing the overall utilization of our Oklahoma crude oil pipeline systems.  Typically, the volume of crude oil we purchase in a given month will be sold in the same month. However, we have market price exposure for inventory that is carried over month-to-month as well as pipeline linefill we maintain. Since our pipeline tariffs require shippers to carry their share of linefill, our crude oil marketing operations, as a shipper, also carries linefill. We may also be exposed to price risk with respect to the differing qualities of crude oil we transport and our ability to effectively blend them to market specifications.

On May 10, 2018, we, together with affiliates of Ergon and Kingfisher Midstream, LLC (“Kingfisher Midstream”), a subsidiary of Alta Mesa Resources, Inc., announced the execution of definitive agreements to form Cimarron Express Pipeline, LLC (“Cimarron Express”). We have an agreement (the “Agreement”) with Ergon that gives each party rights concerning the purchase or sale of Ergon’s interest in Cimarron Express, subjectSee Note 10 to certain terms and conditions. Cimarron Express was formed to build a new 16-inch diameter, 65-mile crude oil pipeline running from northeastern Kingfisher County, Oklahoma to the Partnership’s Cushing, Oklahoma crude oil terminal, with an originally anticipated in-service date in the second half of 2019. Ergon formed a Delaware limited liability company, Ergon - Oklahoma Pipeline, LLC (“DEVCO”), which holds Ergon’s 50% membership interest in Cimarron Express. Under the Agreement, we have the right, at any time, to purchase 100% of the authorized and outstanding member interests in DEVCO from Ergonour unaudited condensed consolidated financial statements for the Purchase Price (as defined in the Agreement), which shall be computed by taking Ergon’s total investment in the Cimarron Express plus interest, by giving written notice to Ergon (the “Call”). Ergon has the right to require us to purchase 100% of the authorized and outstanding member interests of DEVCO for the Purchase Price (the “Put”) at any time beginning the earlier of (i) 18 months from the formation, May 9, 2018, of the joint venture company to build the pipeline, (ii) six months after completion of the pipeline, or (iii) the event of dissolution of Cimarron Express. Upon exercise of the Call or the Put, we and Ergon will execute the Member Interest Purchase Agreement, which is attached to the Agreement as Exhibit B. Upon receipt of the Purchase Price, Ergon shall be obligated to convey 100% of the authorized and outstanding member interests in DEVCO to us or our designee. As of March 31, 2019, neither Ergon nor the Partnership has exercised their options under the Agreement.

In December 2018, we and Ergon were informed that Kingfisher Midstream made the decision to suspend future investments in Cimarron Express as Kingfisher Midstream determined that the anticipated volumes from the currently dedicated acreage, and the resultant project economics, did not support additional investment from Kingfisher Midstream. As of December 31, 2018, Cimarron Express had spent approximately $30.6 milliondiscussion on the pipeline project, primarily related to the purchasecurrent status of steel pipe and equipment, rights of way and engineering and design services. Cimarron Express recorded a $20.9 million impairment charge in the fourth quarter of 2018 to reduce the carrying amount of its assets to their estimated fair value. In addition to its capital contributions to Cimarron Express, Ergon’s interest in DEVCO includes internal Ergon labor and capitalized interest that bring its investment in DEVCO to approximately $17.8 million through March 31, 2019. Ergon recorded a $10.0 million other-than-temporary impairment on its investment in Cimarron Express as of December 31, 2018 to reduce its investment to its estimated fair value. As a result, we considered the SEC staff’s opinions outlined in SAB 107 Topic 5.T Accounting for Expenses or Liabilities Paid by Principal Stockholders. The Agreement was designed to have us, ultimately and from the onset, bear any risk of loss on the construction of the pipeline project and eventually own a 50% interest in the pipeline. As a result, we recorded on a push down basis a $10.0 million impairment of Ergon’s investment in Cimarron Express in our consolidated results of operations during the year ended December 31, 2018, and a contingent liability payable to Ergon as of December 31, 2018. During the three months ended March 31, 2019, a change in estimate resulted in an additional impairment expense of $0.8 million. In April 2019, certain assets from the project were sold to a third-party for approximately $1.4 million over the fair market value that was estimated at December 31, 2018. As a result, we will record in April 2019, on a push down basis, a gain on the sale based on Ergon’s 50% interest in the assets.

this project.

Crude Oil Trucking Services - Crude oil trucking, while potentially influenced by the shape of the crude oil market curve, is typically impacted more by overall drilling activity and the ability to have the appropriate level of assets located properly to efficiently move the barrels to delivery points for customers.

On April 24, 2018, we sold our producer field services business, which has been historically reported along with the crude oil trucking services.

Our Revenues 

Our revenues consist of (i) terminalling revenues, (ii) gathering and transportation revenues, (iii) product sales revenues and (iv) fuel surcharge revenues. For the threesix months ended March 31,June 30, 2019, the Partnership recognized revenues of $9.1$17.9 million and $0.1$0.2 million for services provided to Ergon and Cimarron Express, respectively, with the remainder of our services being provided to third parties.

Terminalling revenues consist of (i) storage service fees resulting from short-term and long-term contracts for committed space that may or may not be utilized by the customer in a given month;month and (ii) terminal throughput service charges to pump crude oil to connecting carriers or to deliver asphalt product out of our terminals. We earn terminalling revenues in two of our segments: (i) asphalt terminalling services and (ii) crude oil terminalling services. Storage service revenues are recognized as the services are provided on a monthly basis. Terminal throughput service charges are recognized as the crude oil or asphalt product is delivered out of our terminal. Storage service revenues are recognized as the services are provided on a monthly basis. We earn terminalling revenues in two of our segments: (i) asphalt terminalling services and (ii) crude oil terminalling services.

We have leases and terminalling agreements with customers for all of our 53 asphalt facilities, including 23 facilities under contract with Ergon.  These agreements have, on average, approximately five4.6 years remaining under their terms. Agreements with one customer for four of the facilities expire by the end of 2019, and the remaining agreements expire at varying times thereafter, including agreements for 23 facilities with Ergon that expire in 2023. We may not be able to extend, renegotiate or replace these contracts when they expire and the terms of any renegotiated contracts may not be as favorable as the contracts they replace. We operate the asphalt facilities pursuant to the terminalling agreements, while our contract counterparties operate the asphalt facilities that are subject to lease agreements.

As of May 6,August 1, 2019, we had approximately 5.8 million barrels of crude oil storage under service contracts, including 3.12.6 million barrels of crude oil storage contracts with third parties that expire in 2019. The remaining terms on the service contracts with third parties range from 56 to 3229 months. Storage contracts with Vitol represent 2.9 million barrels of crude oil storage capacity under contract, and an additional 0.5 million barrels are under an intercompanyintersegment contract.

There is no certainty that we will have success in contracting available capacity or that extended or new contracts will be at the same or similar rates as expiring contracts. If we are unable to renew the majorityeven some of the expiring storage contracts, we may experience lower utilization of our assets which could have a material adverse effect on our business, cash flows, ability to make distributions to our unitholders, the price of our common units, results of operations and ability to conduct our business.

Gathering and transportation services revenues consist of service fees recognized for the gathering of crude oil for our customers and the transportation of crude oil to refiners, to common carrier pipelines for ultimate delivery to refiners or to terminalling facilities owned by us and others. We earn gathering and transportation revenues in two of our segments: (i) crude oil pipeline services and (ii) crude oil trucking services. Revenue for the gathering and transportation of crude oil is recognized when the service is performed and is based upon regulated and non-regulated tariff rates and the related transport volumes.

The following is a summary of our average gathering and transportation volumes for the periods indicated (in thousands of barrels per day):
Three Months ended
March 31,
 Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
2018 2019 Three Months2018 2019 2018 2019 Three Months Six Months
Average pipeline throughput volume23
 37
 14
 61%20
 32
 21
 34
 12
 60% 13
 62%
Average trucking transportation volume23
 27
 4
 17%26
 27
 25
 27
 1
 4% 2
 8%
  
We completed work on the Eagle pipeline system and restored service in July 2018, increasing the transportation capacity of our pipeline systems by approximately 20,000 Bpd. See Crude oil pipeline services segment within our results of operations discussion for additional detail. Vitol accounted for 57%25% and 41%40% of volumes transported in our pipelines in the three months ended March 31,June 30, 2018 and 2019, respectively. Vitol accounted for 43% and 40% of volumes transported in our pipelines in the six months ended June 30, 2018 and 2019, respectively.


Product sales revenues are comprised of (i) revenues recognized for the sale of crude oil to our customers that we purchase at production leases and (ii) revenue recognized in buy/sell transactions with our customers. We earn product sales revenue in our crude oil pipeline services operating segment. Product sales revenue is recognized for products upon delivery and when the customer assumes the risks and rewards of ownership. We earn product sales revenue in our crude oil pipeline services operating segment.

Fuel surcharge revenues are comprised of revenues recognized for the reimbursement of fuel and power consumed to operate our asphalt terminals.  We recognize fuel surcharge revenues in the period in which the related fuel and power expenses are incurred.

Our Expenses

Operating expenses decreased by 13%12% for the threesix months ended March 31,June 30, 2019, as compared to the threesix months ended March 31,June 30, 2018. In addition to decreases related to the sale of the three asphalt plants in July 2018, depreciation expense decreased due to certain assets reaching the end of their depreciable lives and vehicle expenses decreased due to a reduction in the size of our fleet. General and administrative expenses decreased 13%24% for the threesix months ended March 31,June 30, 2019, as compared to the threesix months ended March 31,June 30, 2018. The decrease is primarily due to decreased compensation expense.and professional fees expense, as well as the receipt of a $0.5 million settlement related to a payment made in 2018 to a fraudulent bank account due to a compromise of the vendor’s email system as disclosed in the 2018 Form 10-K. Our interest expense increased by $0.7$0.2 million for the threesix months ended March 31,June 30, 2019, as compared to the threesix months ended March 31,June 30, 2018. See Interest expense within our results of operations discussion for additional detail regarding the factors that contributed to the increase in interest expense in 2019.

Income Taxes

As part of the process of preparing the unaudited condensed consolidated financial statements, we are required to estimate the federal and state income taxes in each of the jurisdictions in which our subsidiary that is taxed as a corporation operates. This process involves estimating the actual current tax exposure together with assessing temporary differences resulting from differing treatment of items, such as depreciation, for tax and accounting purposes. These differences result in deferred tax assets and liabilities, which are included in our unaudited condensed consolidated balance sheets. We must then assess, using all available positive and negative evidence, the likelihood that the deferred tax assets will be recovered from future taxable income. Unless we believe that recovery is more likely than not, we must establish a valuation allowance. To the extent we establish a valuation allowance or increase or decrease this allowance in a period, we must include an expense or reduction of expense within the tax provisions in the unaudited condensed consolidated statements of operations.

Under ASC 740 – Accounting for Income Taxes, an enterprise must use judgment in considering the relative impact of negative and positive evidence. The weight given to the potential effect of negative and positive evidence should be commensurate with the extent to which it can be objectively verified. The more negative evidence that exists, (a) the more positive evidence is necessary and (b) the more difficult it is to support a conclusion that a valuation allowance is not needed for some portion or all of the deferred tax asset. Among the more significant types of evidence that we consider are:

taxable income projections in future years;
future revenue and operating cost projections that will produce more than enough taxable income to realize the deferred tax asset based on existing service rates and cost structures; and
our earnings history exclusive of the loss that created the future deductible amount coupled with evidence indicating that the loss is an aberration rather than a continuing condition.

Based on the consideration of the above factors for our subsidiary that is taxed as a corporation for purposes of determining the likelihood of realizing the benefits of the deferred tax assets, we have provided a full valuation allowance against our deferred tax asset as of March 31,June 30, 2019.

Distributions
 
The amount of distributions we pay and the decision to make any distribution is determined by the Board of Directors of our General Partner (the “Board”), which has broad discretion to establish cash reserves for the proper conduct of our business and for future distributions to our unitholders. In addition, our cash distribution policy is subject to restrictions on distributions under our credit agreement. 


On April 22,July 18, 2019, we announced that the Board approved a cash distribution of $0.17875 per outstanding Preferred Unitpreferred unit for the three months ended March 31,June 30, 2019. We will pay this distribution on MayAugust 14, 2019, to unitholders of record as of May 3,August 2, 2019. The total distribution will be approximately $6.4 million, with approximately $6.3 million and $0.1 million paid to our preferred unitholders and General Partner, respectively.

In addition, the Board approved a cash distribution of $0.04 per outstanding common unit for the three months ended March 31,June 30, 2019. We will pay this distribution MayAugust 14, 2019, to unitholders of record on May 3,August 2, 2019. The total distribution will be approximately $1.7 million, with approximately $1.6 million and less than $0.1 million paid to our common unitholders and General Partner, respectively, and less than $0.1 million paid to holders of phantom and restricted units pursuant to awards granted under our Long-Term Incentive Plan.

Results of Operations

Non-GAAP Financial Measures
 
To supplement our financial information presented in accordance with GAAP, management uses additional measures that are known as “non-GAAP financial measures” in its evaluation of past performance and prospects for the future.  The primary measure used by management is operating margin, excluding depreciation and amortization.
 
Management believes that the presentation of such additional financial measures provides useful information to investors regarding our performance and results of operations because these measures, when used in conjunction with related GAAP financial measures, (i) provide additional information about our core operating performance and ability to generate and distribute cash flow; (ii) provide investors with the financial analytical framework upon which management bases financial,

operational, compensation and planning decisions and (iii) present measurements that investors, rating agencies and debt holders have indicated are useful in assessing us and our results of operations. These additional financial measures are reconciled to the most directly comparable measures as reported in accordance with GAAP, and should be viewed in addition to, and not in lieu of, our unaudited condensed consolidated financial statements and footnotes. 
    
The table below summarizes our financial results for the three and six months ended March 31,June 30, 2018 and 2019, reconciled to the most directly comparable GAAP measure:
Operating ResultsThree Months ended March 31, Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
Three Months  Three Months Six Months
(dollars in thousands)2018 2019 $ %2018 2019 2018 2019 $ % $ %
Operating margin, excluding depreciation and amortization:                      
Asphalt terminalling services$15,280
 $13,518
 $(1,762) (12)%$16,718
 $13,792
 $31,996
 $27,308
 $(2,926) (18)% $(4,688) (15)%
Crude oil terminalling services3,325
 2,589
 (736) (22)%2,179
 3,281
 5,505
 5,871
 1,102
 51 % 366
 7 %
Crude oil pipeline services(60) 1,813
 1,873
 3,122 %(570) 325
 (632) 2,139
 895
 157 % 2,771
 438 %
Crude oil trucking services(290) (58) 232
 80 %(197) 69
 (485) 11
 266
 135 % 496
 102 %
Total operating margin, excluding depreciation and amortization18,255
 17,862
 (393) (2)%18,130
 17,467
 36,384
 35,329
 (663) (4)% (1,055) (3)%
                      
Depreciation and amortization(7,367) (6,734) 633
 9 %(7,413) (6,237) (14,779) (12,971) 1,176
 16 % 1,808
 12 %
General and administrative expense(4,221) (3,693) 528
 13 %(4,486) (2,962) (8,707) (6,655) 1,524
 34 % 2,052
 24 %
Asset impairment expense(616) (1,119) (503) (82)%
 (1,114) (616) (2,233) (1,114) N/A (1,617) (263)%
Gain (loss) on sale of assets(236) 1,724
 1,960
 831 %
Gain on sale of assets599
 81
 363
 1,805
 (518) (86)% 1,442
 397 %
Operating income5,815
 8,040
 2,225
 38 %6,830
 7,235
 12,645
 15,275
 405
 6 % 2,630
 21 %
                      
Other income (expenses):                      
Other income
 268
 
 268
 268
 N/A 268
 N/A
Gain on sale of unconsolidated affiliate2,225
 
 (2,225) (100)%
 
 2,225
 
 
  % (2,225) (100)%
Interest expense(3,569) (4,271) (702) (20)%(5,024) (4,134) (8,593) (8,405) 890
 18 % 188
 2 %
Provision for income taxes(29) (12) 17
 59 %(21) (13) (50) (25) 8
 38 % 25
 50 %
Net income$4,442
 $3,757
 $(685) (15)%$1,785
 $3,356
 $6,227
 $7,113
 $1,571
 88 % $886
 14 %
 
For the three and six months ended March 31,June 30, 2019, overall operating margin, excluding depreciation and amortization, decreased slightly as compared to the same period in 2018. Our asphalt terminalling services segment operating margin, excluding

depreciation and amortization, was impacted by both the acquisition of an asphalt facility in March 2018 and the sale of three asphalt terminals to Ergon in July 2018. The decreaseincrease in our crude oil terminalling services operating margin, excluding depreciation and amortization, is primarily due to loweran increase in rented storage rates.capacity. Our Mid-Continent pipeline was placed back in service in July 2018, after suspending service in April 2016 due to the discovery of a pipeline exposure on a riverbed in southern Oklahoma, and margins in our crude oil pipeline services segment reflect the recovery of throughput volumes since then. AAn $0.8 million sale of crude oil product accumulated over time through customer loss allowance deductions for the threesix months ended March 31,June 30, 2019, also contributed to the increased margin in our crude oil pipeline services segment; there were no such sales in the same periodperiods in 2018. Crude oil trucking services operating margin, excluding depreciation and amortization, improved for the three and six months ended March 31,June 30, 2019, due to an increase in volumes transported.

    A more detailed analysis of changes in operating margin by segment follows.


Analysis of Operating Segments

Asphalt terminalling services segment

Our asphalt terminalling services segment operations generally consist of fee-based activities associated with providing terminalling services, including storage, blending, processing and throughput services, for asphalt product and residual fuel oil. Revenue is generated through operating lease contracts and storage, throughput and handling contracts.

The following table sets forth our operating results from our asphalt terminalling services segment for the periods indicated:
Operating resultsThree Months
ended
March 31,
 Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
Three Months  Three Months Six Months
(dollars in thousands)2018 2019 $ %2018 2019 2018 2019 $ % $ %
Service revenue:                      
Third-party revenue$5,132
 $6,982
 $1,850
 36 %$6,639
 $6,850
 $11,771
 $13,831
 $211
 3 % $2,060
 18 %
Related-party revenue6,321
 4,118
 (2,203) (35)%5,981
 3,981
 12,302
 8,098
 (2,000) (33)% (4,204) (34)%
Lease revenue:                      
Third-party revenue9,458
 9,763
 305
 3 %10,016
 9,819
 19,473
 19,582
 (197) (2)% 109
 1 %
Related-party revenue7,702
 4,940
 (2,762) (36)%7,475
 4,812
 15,178
 9,752
 (2,663) (36)% (5,426) (36)%
Total revenue28,613
 25,803
 (2,810) (10)%30,111
 25,462
 58,724
 51,263
 (4,649) (15)% (7,461) (13)%
Operating expense, excluding depreciation and amortization13,333
 12,285
 1,048
 8 %13,393
 11,670
 26,728
 23,955
 1,723
 13 % 2,773
 10 %
Operating margin, excluding depreciation and amortization$15,280
 $13,518
 $(1,762) (12)%$16,718
 $13,792
 $31,996
 $27,308
 $(2,926) (18)% $(4,688) (15)%

The following is a discussion of items impacting asphalt terminalling services segment operating margin for the periods indicated:

Total revenue decreased for the three and six months ended March 31,June 30, 2019, as compared to the three and six months ended March 31,June 30, 2018. The sale of the three asphalt facilities in July 2018 resulted in a decrease of revenue of $4.6 million and $9.6 million for the three and six month periods, respectively. The decrease for the six month period was offset in part by an increase in revenue of $1.4 million due to the asphalt facility acquired in March 2018 and a contract change on another asphalt facility from a related-party lease to a third-party storage contract resulted in an increase of $1.2 million and $0.3 million, respectively, in revenue and was offset by a decrease in revenue of $5.0 million due to the sale of three asphalt facilities in July 2018.contract.

Operating expenses decreased for the three and six months ended March 31,June 30, 2019, as compared to the three and six months ended March 31, 2018, primarily as a result ofJune 30, 2018. For the three month comparative periods, the sale of three facilities sold in July 2018 andled to a decrease in operating expenses of $2.2 million, which was partially offset by net flood-related expenses of $0.1 million, and increased utility costs at some facilities. For the six month comparative periods, the sale of three facilities in July 2018 led to a decrease in operating expenses of $4.8 million, which was partially offset by an increase of $0.7 million related to the acquisition in March 2018, as well as,net flood-related expenses of $0.2 million, and increased utility costs at some facilities.






Crude oil terminalling services segment

Our crude oil terminalling services segment operations generally consist of fee-based activities associated with providing terminalling services, including storage, blending, processing and throughput services for crude oil. Revenue is generated through short- and long-term storage contracts.

The following table sets forth our operating results from our crude oil terminalling services segment for the periods indicated:
Operating resultsThree Months
ended
March 31,
 Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
Three Months  Three Months Six Months
(dollars in thousands)2018 2019 $ %2018 2019 2018 2019 $ % $ %
Service revenue:                      
Third-party revenue$4,585
 $3,573
 $(1,012) (22)%$2,910
 $4,020
 $7,496
 $7,594
 $1,110
 38 % $98
 1 %
Intersegment revenue
 298
 298
 N/A170
 278
 170
 576
 108
 64 % 406
 239 %
Lease revenue:                      
Third-party revenue15
 
 (15) (100)%12
 
 27
 
 (12) (100)% (27) (100)%
Total revenue4,600
 3,871
 (729) (16)%3,092
 4,298
 7,693
 8,170
 1,206
 39 % 477
 6 %
Operating expense, excluding depreciation and amortization1,275
 1,282
 (7) (1)%913
 1,017
 2,188
 2,299
 (104) (11)% (111) (5)%
Operating margin, excluding depreciation and amortization$3,325
 $2,589
 $(736) (22)%$2,179
 $3,281
 $5,505
 $5,871
 $1,102
 51 % $366
 7 %
                      
Average crude oil storage contracted per month at our Cushing terminal (in thousands of barrels)4,088
 5,895
 4,568
 5,665
 1,807
 44 % 1,097
 24 %
Average crude oil stored per month at our Cushing terminal (in thousands of barrels)1,843
 3,157
 1,314
 71 %1,126
 3,757
 1,485
 3,457
 2,631
 234 % 1,972
 133 %
Average crude oil delivered to our Cushing terminal (in thousands of barrels per day)82
 70
 (12) (15)%
Average crude oil delivered through our Cushing terminal (in thousands of barrels per day)36
 91
 59
 81
 55
 153 % 22
 37 %

The following is a discussion of items impacting crude oil terminalling services segment operating margin for the periods indicated:

Total revenues for three and six months ended March 31,June 30, 2019, have decreasedincreased as compared to the same period in 2018 due to a decreasean increase in market rates forrented storage contracts.capacity and an increase in crude oil delivered through the terminal.

Operating expenses for the three and six months ended March 31,June 30, 2019, were generally consistent withincreased slightly compared to the three and six months ended March 31, 2018.June 30, 2018 due to an increase in repair expenses.

As of May 6,August 1, 2019, we had approximately 5.8 million barrels of crude oil storage under service contracts, including 3.12.6 million barrels of crude oil storage contracts with third parties that expire in 2019. The remaining terms on the service contracts with third parties range from 56 to 3229 months. Storage contracts with Vitol represent 2.9 million barrels of crude oil storage capacity under contract, and an additional 0.5 million barrels are under an intercompanyintersegment contract.







Crude oil pipeline services segment

Our crude oil pipeline services segment operations include both service and product sales revenue. Service revenue generally consists of tariffs and other fees associated with transporting crude oil products on pipelines. Product sales revenue is comprised of (i) revenues recognized for the sale of crude oil to our customers that we purchase at production leases and (ii) revenue recognized in buy/sell transactions with our customers. Product sales revenue is recognized for products upon delivery and when the customer assumes the risks and rewards of ownership.

The following table sets forth our operating results from our crude oil pipeline services segment for the periods indicated:
Operating resultsThree Months ended
March 31,
 Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
Three Months Three Months Six Months
(dollars in thousands)2018 2019 $ %2018 2019 2018 2019 $ % $ %
Service revenue:                      
Third-party revenue$2,061
 $2,498
 $437
 21 %$1,045
 $1,972
 $3,105
 $4,470
 $927
 89 % $1,365
 44 %
Related-party revenue
 101
 101
 N/A82
 101
 82
 203
 19
 23 % 121
 148 %
Lease revenue:                      
Third-party revenue235
 
 (235) (100)%177
 
 412
 
 (177) (100)% (412) (100)%
Product sales revenue:                 

    
Third-party revenue3,508
 58,924
 55,416
 1,580 %45,612
 59,636
 49,120
 118,560
 14,024
 31 % 69,440
 141 %
Total revenue5,804
 61,523
 55,719
 960 %46,916
 61,709
 52,719
 123,233
 14,793
 32 % 70,514
 134 %
Operating expense, excluding depreciation and amortization2,785
 2,722
 63
 2 %2,542
 2,749
 5,327
 5,471
 (207) (8)% (144) (3)%
Intersegment operating expense442
 1,627
 (1,185) (268)%1,156
 1,704
 1,599
 3,331
 (548) (47)% (1,732) (108)%
Third-party cost of product sales2,637
 24,587
 (21,950) (832)%20,041
 20,510
 22,678
 45,097
 (469) (2)% (22,419) (99)%
Related-party cost of product sales
 30,774
 (30,774) N/A23,747
 36,421
 23,747
 67,195
 (12,674) (53)% (43,448) (183)%
Operating margin, excluding depreciation and amortization$(60) $1,813
 $1,873
 3,122 %$(570) $325
 $(632) $2,139
 $895
 157 % $2,771
 438 %
                      
Pipeline transportation services average throughput volume (in thousands of barrels per day)23
 37
 14
 61 %20
 32
 21
 34
 12
 60 % 13
 62 %
                      
Crude oil marketing volumes (in thousands of barrels per day)                      
Sales1
 12
 11
 1,100 %7
 11
 4
 12
 4
 57 % 8
 200 %
Purchases1
 12
 11
 1,100 %9
 11
 5
 11
 2
 22 % 6
 120 %

The following is a discussion of items impacting crude oil pipeline services segment operating margin for the periods indicated:

The majority of the increase in pipeline throughput volume for the three and six months ended March 31,June 30, 2019, compared to the three and six months ended March 31,June 30, 2018, is attributed to the crude oil marketing activities conducted in our crude oil pipeline services segment. Throughput volumes related to the crude oil marketing business were approximately 12,00011,000 barrels per day, or 32%approximately 35% of total throughput, for the three and six months ended March 31,June 30, 2019, compared to approximately 1,000while throughput volumes averaged 9,000 and 5,000 barrels per day infor the previous year.three and six months ended June 30, 2018, respectively. The service revenue for this activity associated with pipeline tariffs is eliminated on an intrasegment basis. Our crude oil pipeline recognized $1.4$1.6 million and $3.0 million in intrasegment service revenue in the three and six months ended March 31,June 30, 2019, respectively, that is not reflected in revenues in the table above. The intrasegment revenues for three and six months ended March 31,June 30, 2018, were $0.4 million.$1.3 million and $1.7 million, respectively. The increases in product sales revenues, intersegment operating expense, and related-party and third-party cost of product sales is also due to the increase in our crude oil marketing business.


In July 2018, we restored service on the second OklahomaEagle pipeline system that had been out of service since April 2016 due to a pipeline exposure on a riverbed in southern Oklahoma. This restored our transportation capacity to the full 50,000 barrels per day. Average throughput for the first quarterhalf of 2019 on the Oklahoma portion of our pipeline system was 35,00032,000 barrels per day, an increase of 71% compared to the same period in 2018.


Operating expenses decreased slightly for the three months ended March 31, 2019, as compared to the three months ended March 31, 2018, due to decreased property tax expense.

Crude oil trucking services segment

Our crude oil trucking services segment operations generally consist of fee-based activity associated with transporting crude oil products on trucks. Revenues are generated primarily through transportation fees.

The following table sets forth our operating results from our crude oil trucking services segment for the periods indicated:
Operating resultsThree Months ended
March 31,
 Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
Three Months  Three Months Six Months
(dollars in thousands)2018 2019 $ %2018 2019 2018 2019 $ % $ %
Service revenue                      
Third-party revenue$5,540
 $2,833
 $(2,707) (49)%$3,509
 $2,885
 $9,049
 $5,718
 $(624) (18)% $(3,331) (37)%
Intersegment revenue442
 1,329
 887
 201 %986
 1,426
 1,429
 2,755
 440
 45 % 1,326
 93 %
Lease revenue:                      
Third-party revenue97
 
 (97) (100)%32
 
 129
 
 (32) (100)% (129) (100)%
Product sales revenue:    
            
 
  
Third-party revenue6
 
 (6) (100)%3
 
 9
 
 (3) (100)% (9) (100)%
Total revenue6,085
 4,162
 (1,923) (32)%4,530
 4,311
 10,616
 8,473
 (219) (5)% (2,143) (20)%
Operating expense, excluding depreciation and amortization6,375
 4,220
 2,155
 34 %4,727
 4,242
 11,101
 8,462
 485
 10 % 2,639
 24 %
Operating margin, excluding depreciation and amortization$(290) $(58) $232
 80 %$(197) $69
 $(485) $11
 $266
 135 % $496
 102 %
                 
    
Average volume (in thousands of barrels per day)23
 27
 4
 17 %26
 27
 25
 27
 1
 4 % 2
 8 %

The following is a discussion of items impacting crude oil trucking services segment operating margin for the periods indicated:

Service revenues decreased for the three and six months ended March 31,June 30, 2019, as compared to the three and six months ended March 31,June 30, 2018, by $2.2$0.5 million and $2.7 million, respectively, due to the sale of the producer field services business in April 2018. This decrease was partially offset by an increase in intersegment service revenues for services provided to our crude oil pipeline services segment’s crude oil marketing business. These volumes transported on an intersegment basis increased from less than 1,0008,000 barrels per day to 10,00011,000 barrels per day.

Operating expense, excluding depreciation and amortization, decreased for the three and six months ended March 31,June 30, 2019, as compared to the three and six months ended March 31,June 30, 2018, by $2.3$0.6 million and $2.9 million, respectively, due to the sale of our producer field services business.

Other Income and Expenses

Depreciation and amortization expense. Depreciation and amortization expense decreased by $0.7$1.2 million to $6.7$6.2 million for the three months ended March 31,June 30, 2019, compared to $7.4 million for the three months ended March 31,June 30, 2018. Depreciation and amortization expense decreased by $1.8 million to $13.0 million for the six months ended June 30, 2019, compared to $14.8 million for the six months ended June 30, 2018. These decreases are primarily the result of certain assets reaching the end of their depreciable lives.
 
General and administrative expense.  General and administrative expense decreased by $0.5 million to $3.7 million for the three and six months ended March 31,June 30, 2019 compared to the same periodperiods in 2018 primarily due to decreases in compensation expense.and professional fees expense,

as well as, the receipt of a $0.5 million settlement related to a payment made in 2018 to a fraudulent bank account due to a compromise of the vendor’s email system.

Asset impairment expense. Asset impairment expense for the six months ended June 30, 2019 included a change in estimate ofand accrued interest related to the push-down impairment related toof Cimarron Express (see Note 10 to our unaudited condensed consolidated financial statements for more information) that resulted in additional impairment expense of $0.8$1.9 million and $0.3 million related to a flood at an asphalt terminal in Wolcott, KS. Asset impairment expense for 2018 included approximately $0.4 million related to the value of obsolete trucking stations, as well as $0.2 million related to an intangible customer contract asset that was not renewed.
 

Gain (loss) on sale of assets. Gain on sale of assets was $1.7$1.8 million for the threesix months ended March 31,June 30, 2019, compared to a loss of $0.2$0.4 million for the threesix months ended March 31,June 30, 2018. Gains for 2019 primarily relate to the sale of certain truck stations in locations not served by our crude oil trucking services segment.

Other income. Other income for the three and six months ended June 30, 2019, relates to insurance recoveries related to flood damages at certain asphalt facilities.

Gain on sale of unconsolidated affiliate. On April 3, 2017, we sold our investment in Advantage Pipeline and received cash proceeds at closing from the sale of approximately $25.3 million, recognizing a gain on sale of unconsolidated affiliate of $4.2 million. Approximately 10% of the gross sale proceeds were held in escrow, subject to certain post-closing settlement terms and conditions. We received approximately $1.1 million of the funds held in escrow in August 2017, for which we recognized an additional gain on sale of unconsolidated affiliate during the three months ended September 30, 2017. We received approximately $2.2 million for the pro rata portion of the remaining net escrow proceeds in January 2018, for which we recognized an additional gain on sale of unconsolidated affiliate during the three months ended March 31,30, 2018.

Interest expense. Interest expense represents interest on borrowings under our credit agreement as well as amortization of debt issuance costs and unrealized gains and losses related to the change in fair value of interest rate swaps. Total interest expense for the three months ended March 31, 2019, increased by $0.7 million compared to the three months ended March 31, 2018. The following table presents the significant components of interest expense:
Three Months ended
March 31,
 Favorable/(Unfavorable)Three Months ended June 30, Six Months ended June 30, Favorable/(Unfavorable)
 Three Months Three Months Six Months
2018 2019 $ %2018 2019 2018 2019 $ % $ %
Credit agreement interest$3,626
 $4,009
 $(383) (11)%$4,415
 $3,861
 $8,042
 $7,871
 $554
 13 % $171
 2 %
Amortization of debt issuance costs256
 251
 5
 2 %256
 251
 512
 503
 5
 2 % 9
 2 %
Interest rate swaps interest expense (income)66
 (40) 106
 161 %
Write-off of debt issuance costs437
 
 437
 
 437
 100 % 437
 100 %
Interest rate swaps interest income(90) 
 (24) (40) (90) (100)% 16
 67 %
Loss (gain) on interest rate swaps mark-to-market(353) 44
 (397) (112)%40
 
 (314) 44
 40
 100 % (358) (114)%
Other(26) 7
 (33) (127)%(34) 22
 (60) 27
 (56) (165)% (87) (145)%
Total interest expense$3,569
 $4,271
 $(702) (20)%$5,024
 $4,134
 $8,593
 $8,405
 $890
 18 % $188
 2 %

Effects of Inflation

In recent years, inflation has been modest and has not had a material impact upon the results of our operations.
 
Off-Balance Sheet Arrangements
 
We do not have any off-balance sheet arrangements as defined by Item 303 of Regulation S-K.
 
Liquidity and Capital Resources

Cash Flows and Capital Expenditures

The following table summarizes our sources and uses of cash for the threesix months ended March 31,June 30, 2018 and 2019
Three Months ended March 31,Six Months ended June 30,
2018 20192018 2019
(in millions)(in millions)
Net cash provided by operating activities$9.9
 $19.5
$21.1
 $22.9
Net cash provided by (used in) investing activities$(24.3) $3.5
$(38.0) $0.1
Net cash provided by (used in) financing activities$13.9
 $(23.3)$15.6
 $(23.0)

 
Operating Activities.  Net cash provided by operating activities increased to $19.5$22.9 million for the threesix months ended March 31,June 30, 2019, as compared to $9.9$21.1 million for the threesix months ended March 31,June 30, 2018, due to increased net income as discussed in Results of Operations above as well as changes in working capital.

Investing Activities.  Net cash provided by investing activities was $3.5$0.1 million for the threesix months ended March 31,June 30, 2019, compared to net cash used by investing activities of $24.3$38.0 million for the threesix months ended March 31,June 30, 2018.  The threesix months ended March 31,June 30, 2019, included proceeds from the sale of certain assets of $6.3$6.4 million. Of such proceeds, $2.6 million related to the December 2018 sale of linefill for which the cash consideration was not received until January 2019. The threesix months ended March 31,June 30, 2018, included proceeds from the sale of an unconsolidated affiliate of $2.2 million. On March 7, 2018, we acquired an asphalt terminalling facility from a third party for $22.0 million. Capital expenditures for the threesix months ended March 31,June 30, 2018 and 2019, included maintenance capital expenditures of $1.8$4.2 million and $2.1$5.2 million, respectively, and expansion capital expenditures of $2.8$17.9 million and $0.7 million.$1.1 million, respectively.

Financing Activities.  Net cash used in financing activities was $23.3$23.0 million for the threesix months ended March 31,June 30, 2019, as compared to net cash provided by financing activities of $13.9$15.6 million for the threesix months ended March 31,June 30, 2018.  Cash used in financing activities for the threesix months ended March 31,June 30, 2019, consisted primarily of net payments on long-term debt of $13.0$4.0 million and $9.7$17.8 million in distributions to our unitholders. Net cash provided by financing activities for the threesix months ended March 31,June 30, 2018, consisted primarily of net borrowings on long-term debt of $27.0$42.0 million partially offset by $12.6$25.2 million in distributions to our unitholders.

Our Liquidity and Capital Resources
 
Cash flows from operations and from our credit agreement are our primary sources of liquidity. At March 31,June 30, 2019, we had a working capital deficit of $16.8$8.4 million. This is primarily a function of our approach to cash management. At March 31,June 30, 2019, we had approximately $146.4$137.4 million of availability under our credit agreement subject to covenant restrictions, which limited our availability to $32.9$37.4 million. As of May 6,August 1, 2019, we have aggregate unused commitments under our revolving credit facility of approximately $147.4$142.4 million and cash on hand of approximately $1.2 million.  The credit agreement is scheduled to mature on May 11, 2022.

Our credit agreement contains certain financial covenants which include a maximum permitted consolidated total leverage ratio, which may limit our availability to borrow funds thereunder.  The consolidated total leverage ratio is assessed quarterly based on the trailing twelve months of EBITDA, as defined in the credit agreement. The maximum permitted consolidated total leverage ratio as of March 31,June 30, 2019, was 5.25 to 1.00, decreases to 5.00 to 1.00 as of September 30, 2019, and decreases to 4.75 to 1.00 as of March 31, 2020, and thereafter. Our consolidated total leverage ratio was 4.644.60 to 1.00 as of March 31,June 30, 2019. 


Management evaluates whether conditions and/or events raise substantial doubt about our ability to continue as a going concern within one year after the date that the consolidated financial statements are issued (the “assessment period”). In performing this assessment, management considered the risk associated with its ongoing ability to meet the financial covenants.

Based on forecasted EBITDA during the assessment period, management believes that it will meet the financial covenants. However, there are certain inherent risks associated with our continued ability to comply with our consolidated total leverage ratio covenant.  These risks relate, among other things, to potential future (a) decreases in storage volumes and rates as well as throughput and transportation rates realized; (b) weather phenomenon that may potentially hinder the asphalt business activity; and (c) other items affecting forecasted levels of expenditures and uses of cash resources. Violation of the consolidated total leverage ratio covenant would be an event of default under the credit agreement, which would cause our $252.6$261.6 million in outstanding debt, as of March 31,June 30, 2019, to become immediately due and payable.  If this were to occur, we would not expect to have sufficient liquidity to repay these outstanding amounts then due, which could cause the lenders under the credit facility to pursue other remedies. Such remedies could include exercising their collateral rights to our assets. Based on our current forecasts, we believe we will be able to comply with the consolidated total leverage ratio during the assessment period.  However, we cannot make any assurances that we will be able to achieve our forecasts. If we are unable to achieve our forecasts, further actions may be necessary to remain in compliance with our consolidated total leverage ratio covenant including, but not limited to, cost reductions, common and preferred unitholder distribution curtailments, and/or asset sales.  We can make no assurances that we would be successful in undertaking these actions, or that we will remain in compliance with the consolidated total leverage ratio during the assessment period.

Based on management’s current forecasts, management believes we will be able to comply with the consolidated total leverage ratio during the assessment period. However, we cannot make any assurances that we will be able to achieve our forecasts. If we are unable to achieve our forecasts, further actions may be necessary to remain in compliance with the consolidated total leverage ratio covenant including, but not limited to, cost reductions, common and preferred unitholder distribution curtailments, and/or asset sales. We can make no assurances that we would be successful in undertaking these actions, or that we will remain in compliance with the consolidated total leverage ratio during the assessment period.

Capital Requirements. Our capital requirements consist of the following:
 

maintenance capital expenditures, which are capital expenditures made to maintain the existing integrity and operating capacity of our assets and related cash flows, further extending the useful lives of the assets; and
expansion capital expenditures, which are capital expenditures made to expand the operating capacity or revenue of existing or new assets, whether through construction, acquisition or modification.

The following table breaks out capital expenditures for the threesix months ended March 31,June 30, 2018 and 2019 (in thousands):
 Three Months ended March 31, Six Months ended June 30,
 2018 2019 2018 2019
Acquisitions 21,959
 
 21,959
 
        
Expansion capital expenditures 2,800
 700
 17,908
 1,081
Reimbursable expenditures (100) 
 (339) (21)
Net expansion capital expenditures 2,700
 700
 17,569
 1,060
        
Gross Maintenance capital expenditures 1,800
 2,100
 4,217
 5,159
Reimbursable expenditures (200) (100) (382) (30)
Net maintenance capital expenditures 1,600
 2,000
 3,835
 5,129

We currently expect our expansion capital expenditures for organic growth projects to be approximately $3.5$3.0 million to $4.5$3.5 million for all of 2019.  We currently expect maintenance capital expenditures to be approximately $9.5$12.0 million to $11.0$13.0 million, net of reimbursable expenditures, for all of 2019.

Our Ability to Grow Depends on Our Ability to Access External Expansion Capital. Our partnership agreement requires that we distribute all of our available cash to our unitholders. Available cash is reduced by cash reserves established by our General Partner to provide for the proper conduct of our business (including for future capital expenditures) and to comply with

the provisions of our credit agreement.  We may not grow as quickly as businesses that reinvest their available cash to expand ongoing operations because we distribute all of our available cash. 

Recent Accounting Pronouncements
 
For information regarding recent accounting developments that may affect our future financial statements, see Note 18 to our unaudited condensed consolidated financial statements.

Item 3.    Quantitative and Qualitative Disclosures about Market Risk.

We are exposed to market risk due to variable interest rates under our credit agreement.


As of May 6,August 1, 2019, we had $251.6$256.6 million outstanding under our credit agreement that was subject to a variable interest rate.  Borrowings under our credit agreement bear interest, at our option, at either the reserve adjusted eurodollar rate (as defined in the credit agreement) plus an applicable margin or the alternate base rate (the highest of the agent bank’s prime rate, the federal funds effective rate plus 0.5%, and the 30-day eurodollar rate plus 1%) plus an applicable margin. Interest rate swap agreements are sometimes used to manage a portion of the exposure related to changing interest rates by converting floating-rate debt to fixed-rate debt. In March 2014, we entered into two interest rate swap agreements with an aggregate notional value of $200.0 million. The first $100.0 million agreement became effective June 28, 2014, and matured on June 28, 2018. Under the terms of the first interest rate swap agreement, we paid a fixed rate of 1.45% and received one-month LIBOR with monthly settlement. The second agreement became effective January 28, 2015, and matured on January 28, 2019. Under the terms of the second interest rate swap agreement, we paid a fixed rate of 1.97% and received one-month LIBOR with monthly settlement. The interest rate swaps did not receive hedge accounting treatment under ASC 815 - Derivatives and Hedging. Changes in the fair value of the interest rate swaps are recorded in interest expense in the unaudited condensed consolidated statements of operations.
 
During the threesix months ended March 31,June 30, 2019, the weighted average interest rate under our credit agreement was 6.43%6.35%.

Changes in economic conditions could result in higher interest rates, thereby increasing our interest expense and reducing our funds available for capital investment, operations or distributions to our unitholders. Based on borrowings as of March 31,June 30, 2019, the terms of our credit agreement, current interest rates and the effect of our interest rate swaps, an increase or decrease of 100 basis points in the interest rate would result in increased or decreased annual interest expense of approximately $2.5$2.6 million. 
 
Item 4.    Controls and Procedures.

Evaluation of disclosure controls and procedures.  Our General Partner’s management, including the Chief Executive Officer and Chief Financial Officer of our General Partner, evaluated, as of the end of the period covered by this report, the effectiveness of our disclosure controls and procedures as defined in Rule 13a-15(e) under the Securities Exchange Act of 1934. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer of our General Partner concluded that our disclosure controls and procedures, as of March 31,June 30, 2019, were effective. 

Changes in internal control over financial reporting.  There were no changes to our internal control over financial reporting that occurred during the three months ended March 31,June 30, 2019, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION
 
Item 1.    Legal Proceedings.

The information required by this item is included under the caption “Commitments and Contingencies” in Note 16 to our unaudited condensed consolidated financial statements and is incorporated herein by reference thereto.

Item 1A.    Risk Factors.
 
See the risk factors set forth in Part I, Item 1A, of our Annual Report on Form 10-K for the year ended December 31, 2018.

Item 6.    Exhibits.

The information required by this Item 6 is set forth in the Index to Exhibits accompanying this quarterly report and is incorporated herein by reference.


SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
 

  BLUEKNIGHT ENERGY PARTNERS, L.P.
    
  By:Blueknight Energy Partners, G.P., L.L.C.
   its General Partner
    
Date:May 9,August 8, 2019By:/s/ D. Andrew Woodward
   D. Andrew Woodward
   Chief Financial Officer
    
Date:May 9,August 8, 2019By:/s/ Michael McLanahan
   Michael McLanahan
   Chief Accounting Officer



INDEX TO EXHIBITS
Exhibit Number Description
3.1 
3.2 

3.3
3.33.4 
3.43.5

3.6 
4.1 
10.1
10.2
10.3
10.4
31.1#31.1* 
31.2#31.2* 
32.1# 
101# 
The following financial information from Blueknight Energy Partners, L.P.’s Quarterly Report on Form 10-Q for the quarter ended March 31,June 30, 2019, formatted in XBRL (eXtensible Business Reporting Language): (i) Document and Entity Information; (ii) Unaudited Condensed Consolidated Balance Sheets as of December 31, 2018 and March 31,June 30, 2019; (iii) Unaudited Condensed Consolidated Statements of Operations for the three and six months ended March 31,June 30, 2018 and 2019; (iv) Unaudited Condensed Consolidated Statement of Changes in Partners’ Capital (Deficit) for the three and six months ended March 31,June 30, 2018 and 2019; (v) Unaudited Condensed Consolidated Statements of Cash Flows for the threesix months ended March 31,June 30, 2018 and 2019; and (vi) Notes to Unaudited Condensed Consolidated Financial Statements.
____________________
*    Filed herewith.
#     Furnished herewith






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