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AMRC Ameresco

Cover Page

Cover Page - shares3 Months Ended
Mar. 31, 2021Apr. 30, 2021
Entity Information [Line Items]
Document Type10-Q
Document Quarterly Reporttrue
Document Period End DateMar. 31,
2021
Document Transition Reportfalse
Entity File Number001-34811
Entity Registrant NameAmeresco, Inc.
Entity Incorporation, State or Country CodeDE
Entity Tax Identification Number04-3512838
Entity Address, Address Line One111 Speen Street
Entity Address, Address Line TwoSuite 410
Entity Address, City or TownFramingham
Entity Address, State or ProvinceMA
Entity Address, Postal Zip Code01701
City Area Code508
Local Phone Number661-2200
Entity Current Reporting StatusYes
Entity Interactive Data CurrentYes
Entity Filer CategoryAccelerated Filer
Entity Small Businessfalse
Entity Emerging Growth Companyfalse
Entity Shell Companyfalse
Entity Central Index Key0001488139
Current Fiscal Year End Date--12-31
Document Fiscal Year Focus2021
Document Fiscal Period FocusQ1
Amendment Flagfalse
Class A Common Stock
Entity Information [Line Items]
Security Exchange NameNYSE
Title of 12(b) SecurityClass A Common Stock, $0.0001 par value per share
Trading SymbolAMRC
Entity Common Stock, Shares Outstanding (in shares)33,270,425
Class B Common Stock
Entity Information [Line Items]
Security Exchange NameNYSE
Title of 12(b) SecurityClass B Common Stock, $0.0001 par value per share
Entity Common Stock, Shares Outstanding (in shares)18,000,000
No Trading Symbol Flagtrue

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Current assets:
Cash and cash equivalents[1] $ 80,971 $ 66,422
Restricted cash[1]24,869 22,063
Accounts receivable, net of allowance of $2,310 and $2,266, respectively[1]113,095 125,010
Accounts receivable retainage, net32,071 30,189
Costs and estimated earnings in excess of billings[1]179,474 185,960
Inventory, net8,527 8,575
Prepaid expenses and other current assets[1]26,753 26,854
Income tax receivable5,446 9,803
Project development costs14,573 15,839
Total current assets[1]485,779 490,715
Federal ESPC receivable459,347 396,725
Property and equipment, net[1]8,804 8,982
Energy assets, net[1]765,122 729,378
Goodwill, net58,812 58,714
Intangible assets, net847 927
Operating lease assets[1]41,484 39,151
Restricted cash, non-current portion10,507 10,352
Other assets[1]18,047 15,307
Total assets[1]1,848,749 1,750,251
Current liabilities:
Current portions of long-term debt and financing lease liabilities[1]71,770 69,362
Accounts payable[1]202,123 230,916
Accrued expenses and other current liabilities[1]40,297 41,748
Current portions of operating lease liabilities[1]5,680 6,106
Billings in excess of cost and estimated earnings30,211 33,984
Income taxes payable1,501 981
Total current liabilities[1]351,582 383,097
Long-term debt and financing lease liabilities, net of current portion and deferred financing fees[1]268,411 311,674
Federal ESPC liabilities473,882 440,223
Deferred income taxes, net4,474 2,363
Deferred grant income8,167 8,271
Long-term operating lease liabilities, net of current portion[1]37,718 35,300
Other liabilities[1]35,992 37,660
Commitments and contingencies (Note 9)
Redeemable non-controlling interests, net39,668 38,850
Stockholders’ equity:
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding at March 31, 2021 and December 31, 20200 0
Additional paid-in capital267,864 145,496
Retained earnings379,533 368,390
Accumulated other comprehensive loss, net(6,759)(9,290)
Treasury stock, at cost, 2,101,795 shares at March 31, 2021 and December 31, 2020(11,788)(11,788)
Total stockholders’ equity628,855 492,813
Total liabilities, redeemable non-controlling interests and stockholders’ equity1,848,749 1,750,251
Class A Common Stock
Stockholders’ equity:
Common stock3 3
Class B Common Stock
Stockholders’ equity:
Common stock $ 2 $ 2
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Accounts receivable, allowance for credit loss, current $ 2,310 $ 2,266
Total assets[1] $ 1,848,749 $ 1,750,251
Preferred stock, par value (in usd per share) $ 0.0001 $ 0.0001
Preferred stock, shares authorized (in shares)5,000,000 5,000,000
Preferred stock, shares issued (in shares)0 0
Preferred stock, shares outstanding (in shares)0 0
Treasury stock, shares (in shares)2,101,795 2,101,795
Class A Common Stock
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares)500,000,000 500,000,000
Common stock, shares issued (in shares)35,367,720 32,326,449
Common stock, shares outstanding (in shares)33,265,925 30,224,654
Class B Common Stock
Common stock, par value (in usd per share) $ 0.0001 $ 0.0001
Common stock, shares authorized (in shares)144,000,000 144,000,000
Common stock, shares issued (in shares)18,000,000 18,000,000
Common stock, shares outstanding (in shares)18,000,000 18,000,000
Variable Interest Entity, Primary Beneficiary
Total assets $ 159,136 $ 162,198
Total liabilities $ 32,614 $ 33,335
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Income Statement [Abstract]
Revenues $ 252,202 $ 212,413
Cost of revenues205,293 173,967
Gross profit46,909 38,446
Selling, general and administrative expenses28,601 28,924
Operating income18,308 9,522
Other expenses, net3,672 5,389
Income before income taxes14,636 4,133
Income tax provision (benefit)2,205 (2,503)
Net income12,431 6,636
Net income attributable to redeemable non-controlling interests(1,257)(435)
Net income attributable to common shareholders $ 11,174 $ 6,201
Net income per share attributable to common shareholders:
Basic (in usd per share) $ 0.23 $ 0.13
Diluted (in usd per share) $ 0.22 $ 0.13
Weighted average common shares outstanding:
Basic (in shares)48,975 47,384
Diluted (in shares)50,357 48,497

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income $ 12,431 $ 6,636
Other comprehensive income (loss):
Unrealized gain (loss) from interest rate hedges, net of tax effect of $719 and $(1,187)2,118 (3,465)
Foreign currency translation adjustments413 (2,312)
Total other comprehensive income (loss)2,531 (5,777)
Comprehensive income14,962 859
Comprehensive gain attributable to redeemable non-controlling interests(1,257)(435)
Comprehensive income attributable to common shareholders $ 13,705 $ 424

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Unrealized gain (loss) from interest rate hedges, tax effect $ 719 $ (1,187)

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Changes in Redeemable Non-Controlling Interests and Stockholders' Equity - USD ($) $ in ThousandsTotalClass A Common StockClass B Common StockCommon StockClass A Common StockCommon StockClass B Common StockAdditional Paid-in CapitalRetained EarningsAccumulated Other Comprehensive LossTreasury Stock
Redeemable non-controlling interests, beginning balance at Dec. 31, 2019 $ 31,616
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions to redeemable non-controlling interests(112)
Net income435
Redeemable non-controlling interests, ending balance at Mar. 31, 202031,939
Beginning balance (in shares) at Dec. 31, 201929,230,005 18,000,000 2,101,340
Beginning balance at Dec. 31, 2019428,856 $ 3 $ 2 $ 133,688 $ 314,459 $ (7,514) $ (11,782)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)280,611
Exercise of stock options2,474 2,474
Stock-based compensation expense429 429
Open market purchase of common shares (in shares)(455)455
Open market purchase of common shares(6) $ (6)
Unrealized gain (loss) from interest rate hedges, net(3,465)(3,465)
Foreign currency translation adjustment(2,312)(2,312)
Net income6,201 6,201
Ending balance (in shares) at Mar. 31, 202029,510,161 18,000,000 2,101,795
Ending balance at Mar. 31, 2020432,177 $ 3 $ 2 136,591 320,660 (13,291) $ (11,788)
Redeemable non-controlling interests, beginning balance at Dec. 31, 202038,850
Increase (Decrease) in Temporary Equity [Roll Forward]
Tax equity financing fees(17)
Distributions to redeemable non-controlling interests(453)
Accretion of tax equity financing fees31
Net income1,257
Redeemable non-controlling interests, ending balance at Mar. 31, 202139,668
Beginning balance (in shares) at Dec. 31, 202030,224,654 18,000,000 30,224,654 18,000,000 2,101,795
Beginning balance at Dec. 31, 2020492,813 $ 3 $ 2 145,496 368,390 (9,290) $ (11,788)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity offering, net of offering costs of $6,284 (in shares)2,875,000
Equity offering, net of offering costs of $6,284120,216 120,216
Exercise of stock options (in shares)166,271
Exercise of stock options1,386 1,386
Stock-based compensation expense766 766
Unrealized gain (loss) from interest rate hedges, net2,118 2,118
Foreign currency translation adjustment413 413
Accretion of tax equity financing fees(31)(31)
Net income11,174 11,174
Ending balance (in shares) at Mar. 31, 202133,265,925 18,000,000 33,265,925 18,000,000 2,101,795
Ending balance at Mar. 31, 2021 $ 628,855 $ 3 $ 2 $ 267,864 $ 379,533 $ (6,759) $ (11,788)

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Changes in Redeemable Non-Controlling Interests and Stockholders' Equity (Parenthetical) $ in Thousands3 Months Ended
Mar. 31, 2021USD ($)
Statement of Stockholders' Equity [Abstract]
Equity offering, offering costs $ 6,284

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Cash flows from operating activities:
Net income $ 12,431 $ 6,636
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation of energy assets, net9,686 9,299
Depreciation of property and equipment833 833
Accretion of ARO liabilities24 21
Amortization of debt discount and debt issuance costs747 660
Amortization of intangible assets80 179
Provision for bad debts3 49
Net gain from derivatives(377)(223)
Stock-based compensation expense766 429
Deferred income taxes1,410 (1,217)
Unrealized foreign exchange loss19 212
Changes in operating assets and liabilities:
Accounts receivable15,535 (14,161)
Accounts receivable retainage(1,844)(4,445)
Federal ESPC receivable(65,973)(39,946)
Inventory, net48 7
Costs and estimated earnings in excess of billings6,544 12,181
Prepaid expenses and other current assets(726)1,233
Project development costs1,259 (3,224)
Other assets(538)8
Accounts payable, accrued expenses and other current liabilities(19,333)(17,241)
Billings in excess of cost and estimated earnings(3,973)(956)
Other liabilities(226)(586)
Income taxes payable4,881 (1,388)
Cash flows from operating activities(38,724)(51,640)
Cash flows from investing activities:
Purchases of property and equipment(656)(724)
Purchases of energy assets(55,823)(28,497)
Contributions to equity investment0 (127)
Cash flows from investing activities(56,479)(29,348)
Cash flows from financing activities:
Proceeds from equity offering, net of offering costs120,216 0
Payments of financing fees(850)(155)
Proceeds from exercises of options and ESPP1,386 2,473
Repurchase of common stock0 (6)
(Payments on) proceeds from senior secured credit facility, net(53,073)31,000
Proceeds from long-term debt financings30,811 0
Proceeds from Federal ESPC projects33,520 61,198
Proceeds for energy assets from Federal ESPC(59)1,541
Distributions to redeemable non-controlling interests, net(495)(103)
Payments on long-term debt(19,073)(12,019)
Cash flows from financing activities112,383 83,929
Effect of exchange rate changes on cash330 (509)
Net increase in cash, cash equivalents, and restricted cash17,510 2,432
Cash, cash equivalents, and restricted cash, beginning of period98,837 77,264
Cash, cash equivalents, and restricted cash, end of period116,347 79,696
Supplemental disclosures of cash flow information:
Cash paid for interest4,235 4,917
Cash paid for income taxes271 183
Non-cash Federal ESPC settlement0 29,297
Accrued purchases of energy assets33,065 34,308
Reconciliation of cash, cash equivalents and restricted cash
Total cash and cash equivalents, and restricted cash $ 116,347 $ 79,696

Basis of Presentation

Basis of Presentation3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of PresentationBASIS OF PRESENTATION The accompanying condensed consolidated financial statements of Ameresco, Inc. (including its subsidiaries, the “Company,” “Ameresco,” “we,” “our,” or “us”) are unaudited, according to certain rules and regulations of the Securities and Exchange Commission, and include, in our opinion, normal recurring adjustments necessary for a fair presentation in conformity with accounting principles generally accepted in the United States (“GAAP”) of the results for the periods indicated. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of results which may be expected for the full year. The December 31, 2020 consolidated balance sheet data was derived from audited financial statements, but certain information and footnote disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. The interim condensed consolidated financial statements and accompanying notes should be read in conjunction with the audited consolidated financial statements and accompanying notes for the year ended December 31, 2020, included in our annual report on Form 10-K (“2020 Annual Report” or “2020 Form 10-K”) for the year ended December 31, 2020 filed with the Securities and Exchange Commission on March 2, 2021. Reclassification Certain prior period amounts were reclassified to conform to the presentation in the current period. Significant Risks and Uncertainties We considered the impact of COVID-19 on the assumptions and estimates used and determined that there was no material adverse impact on our results of operations for the three months ended March 31, 2021 or 2020. Our results of future operations and liquidity could be adversely impacted by a number of factors associated with the COVID-19 pandemic, including payments of outstanding receivable amounts beyond normal payment terms, delays in obtaining signed customer contracts for awarded projects, supply chain disruptions and uncertain demand. As of the date of issuance of these condensed consolidated financial statements, the extent to which the COVID-19 pandemic may impact our financial condition, liquidity, or results of operations in the future is uncertain.

Summary of Significant Accounti

Summary of Significant Accounting Policies3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Significant Accounting PoliciesSUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Our accounting policies are set forth in Note 2 to the consolidated financial statements contained in our 2020 Form 10-K . We have included certain updates to those policies below. Accounts Receivable and Allowance for Credit Losses Changes in the allowance for credit losses are as follows: March 31, 2021 March 31, 2020 Allowance for credit losses, beginning of period $ 2,266 $ 2,260 Charges to costs and expenses, net 3 49 Account write-offs and other 41 (189) Allowance for credit losses, end of period $ 2,310 $ 2,120 Recent Accounting Pronouncements Income Taxes In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes, which simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for our fiscal year beginning after December 15, 2020. We adopted this guidance as of January 1, 2021 and the adoption did not have an impact on our condensed consolidated financial statements. Reference Rate Reform In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04, which provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. Companies can apply the ASU immediately, however, the guidance will only be available until December 31, 2022. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements and related disclosures. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The amendments in ASU 2021-01 provide optional expedients to the current guidance on contract modification and hedge accounting from the expected market transition from LIBOR and other interbank offered rates to alternative reference rates. The guidance generally can be applied to applicable contract modifications through December 31, 2022. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements and related disclosures. Codification Improvements In October 2020, the FASB issued ASU 2020-10 Codification Improvements. The amendments in this ASU represent changes to clarify the Accounting Standard Codifications, correct unintended application of guidance, or make minor improvements to the ASC that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. ASU 2020-10 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods, with early adoption permitted. The amendments in this ASU should be applied retrospectively. We adopted this guidance as of January 1, 2021 and the adoption did not have an impact on our condensed consolidated financial statements.

Revenue from Contracts with Cus

Revenue from Contracts with Customers3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with CustomersREVENUE FROM CONTRACTS WITH CUSTOMERS Disaggregation of Revenue Our reportable segments for the three months ended March 31, 2021 are U.S. Regions, U.S. Federal, Canada and Non-Solar Distributed Generation (“Non-Solar DG”). We changed the structure of our internal organization and our U.S. Regions segment now includes our U.S.-based enterprise energy management services previously included in our “All Other” segment. As a result, previously reported amounts have been restated for comparative purposes. The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2021: U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Project revenue $ 71,158 $ 90,089 $ 9,001 $ 4,654 $ 5,791 $ 180,693 O&M revenue 4,310 11,440 26 2,637 71 18,484 Energy assets 8,810 664 747 22,931 135 33,287 Integrated-PV — — — — 9,154 9,154 Other 995 21 1,869 146 7,553 10,584 Total revenues $ 85,273 $ 102,214 $ 11,643 $ 30,368 $ 22,704 $ 252,202 The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2020: U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Project revenue $ 71,493 $ 56,114 $ 8,864 $ 2,371 $ 5,587 $ 144,429 O&M revenue 4,352 11,626 9 2,015 60 18,062 Energy assets 8,854 719 663 17,986 — 28,222 Integrated-PV — — — — 11,469 11,469 Other 1,141 286 1,856 352 6,596 10,231 Total revenues $ 85,840 $ 68,745 $ 11,392 $ 22,724 $ 23,712 $ 212,413 For the three months ended March 31, 2021 and 2020, approximately 94% and 91%, respectively, of revenue is recognized over time, and the remainder is for products and services transferred at a point in time. We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area: Three Months Ended March 31, 2021 2020 United States $ 234,009 $ 195,939 Canada 10,853 10,553 Other 7,340 5,921 Total revenues $ 252,202 $ 212,413 Contract Balances The following tables provide information about receivables, contract assets and contract liabilities from contracts with customers: March 31, 2021 December 31, 2020 Accounts receivable, net $ 113,095 $ 125,010 Accounts receivable retainage, net $ 32,071 $ 30,189 Contract Assets: Costs and estimated earnings in excess of billings $ 179,474 $ 185,960 Contract Liabilities: Billings in excess of cost and estimated earnings $ 30,211 $ 33,984 Billings in excess of cost and estimated earnings, non-current (1) 6,590 6,631 Total contract liabilities $ 36,801 $ 40,615 March 31, 2020 December 31, 2019 Accounts receivable, net $ 110,742 $ 95,863 Accounts receivable retainage, net $ 21,265 $ 16,976 Contract Assets: Costs and estimated earnings in excess of billings $ 189,566 $ 202,243 Contract Liabilities: Billings in excess of cost and estimated earnings $ 25,350 $ 26,618 Billings in excess of cost and estimated earnings, non-current (1) 5,320 5,560 Total contract liabilities $ 30,670 $ 32,178 (1) Performance obligations are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets. The decrease in contract assets for the three months ended March 31, 2021 was primarily due to billings of $144,539, offset in part by revenue recognized of approximately $130,297. The decrease in contract liabilities was primarily driven by recognition of revenue as performance obligations were satisfied exceeding increases from the receipt of advance payment from customers, and related billings. For the three months ended March 31, 2021, we recognized revenue of $45,483 that was previously included in the beginning balance of contract liabilities and billed customers $33,081. Changes in contract liabilities are also driven by reclassifications to or from contract assets as a result of timing of customer payments. The decrease in contract assets for the three months ended March 31, 2020 was primarily due to billings of approximately $151,885, partially offset by revenue recognized of $137,220. The decrease in contract liabilities was primarily driven by recognition of revenue as performance obligations were satisfied exceeding increases from the receipt of advance payment from customers, and related billings. For the three months ended March 31, 2020, we recognized revenue of $19,928 that was previously included in the beginning balance of contract liabilities, and billed customers $16,377. Changes in contract liabilities are also driven by reclassifications to or from contract assets as a result of timing of customer payments. Performance Obligations Our remaining performance obligations (“backlog”) represent the unrecognized revenue value of our contract commitments. At March 31, 2021, we had backlog of $1,914,710 of which approximately 35% is anticipated to be recognized as revenue in the next twelve months. The remaining performance obligations primarily relate to the energy efficiency and renewable energy construction projects, including long-term O&M services related to these projects. The long-term services have varying initial contract terms, up to 25 years. Project Development Costs Project development costs of $1,559 and $1,543 were included in other long-term assets in the accompanying condensed consolidated balance sheets as of March 31, 2021 and December 31, 2020, respectively. Project development costs of $1,985 and $1,635 were recognized in the condensed consolidated statements of income on projects that converted to customer contracts during the three months ended March 31, 2021 and 2020, respectively. No impairment charges in connection with our capitalized commission costs or project development costs were recorded during the three months ended March 31, 2021 and 2020.

Goodwill and Intangible Assets,

Goodwill and Intangible Assets, Net3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets, NetGOODWILL AND INTANGIBLE ASSETS, NET The changes in the carrying value of goodwill balances by reportable segment was as follows: U.S. Regions U.S. Federal Canada Non-solar DG Other Total Balance, December 31, 2020 $ 26,705 $ 3,981 $ 3,441 $ — $ 24,587 $ 58,714 Currency effects — — 41 — 57 98 Balance, March 31, 2021 $ 26,705 $ 3,981 $ 3,482 $ — $ 24,644 $ 58,812 Definite-lived intangible assets, net consisted of the following: As of March 31, 2021 As of December 31, 2020 Gross carrying amount $ 27,240 27,240 Accumulated amortization 26,393 26,313 Intangible assets, net $ 847 $ 927 The table below sets forth amortization expense: Three Months Ended March 31, Asset type Location 2021 2020 Customer contracts Cost of revenues $ — $ 22 All other intangible assets Selling, general and administrative expenses 80 157 Total amortization expense $ 80 $ 179

Energy Assets, Net

Energy Assets, Net3 Months Ended
Mar. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Energy Assets, NetENERGY ASSETS, NET Energy assets, net consisted of the following: March 31, 2021 December 31, 2020 Energy assets (1) $ 1,000,085 $ 954,426 Less - accumulated depreciation and amortization (234,963) (225,048) Energy assets, net $ 765,122 $ 729,378 (1) Includes financing lease assets (see Note 6), capitalized interest and ARO assets (see tables below). The following table sets forth our depreciation and amortization expense on energy assets, net of deferred grant amortization: Three Months Ended March 31, Location 2021 2020 Cost of revenues (2) $ 9,686 $ 9,299 (2) Includes depreciation and amortization on financing lease assets (see Note 6). The following table presents the interest costs relating to construction financing during the period of construction, which were capitalized as part of energy assets, net: Three Months Ended March 31, 2021 2020 Capitalized interest $ 2,238 $ 862 The following tables sets forth information related to our ARO assets and ARO liabilities: Location March 31, 2021 December 31, 2020 ARO assets, net Energy assets, net $ 2,032 $ 1,468 ARO liabilities, current Accrued expenses and other current liabilities $ 6 $ 86 ARO liabilities, non-current Other liabilities 2,251 1,561 Total ARO liabilities $ 2,257 $ 1,647 Three Months Ended March 31, 2021 2020 Depreciation expense of ARO assets $ 23 $ 19 Accretion expense of ARO liabilities $ 24 $ 21

Leases

Leases3 Months Ended
Mar. 31, 2021
Leases [Abstract]
LeasesLEASES The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: March 31, 2021 December 31, 2020 Operating Leases: Operating lease assets $ 41,484 $ 39,151 Current portions of operating lease liabilities $ 5,680 6,106 Long-term portions of operating lease liabilities 37,718 35,300 Total operating lease liabilities $ 43,398 $ 41,406 Weighted-average remaining lease term 12 years 12 years Weighted-average discount rate 5.81 % 5.94 % Financing Leases: Energy assets $ 33,473 $ 34,005 Current portions of financing lease liabilities $ 4,273 4,273 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 19,199 19,227 Total financing lease liabilities $ 23,472 $ 23,500 Weighted-average remaining lease term 16 years 16 years Weighted-average discount rate 11.93 % 11.94 % The costs related to our leases were as follows: Three Months Ended March 31, 2021 2020 Operating Leases: Operating lease costs $ 2,153 $ 1,826 Financing Leases: Amortization expense 532 532 Interest on lease liabilities 658 801 Total lease costs $ 3,343 $ 3,159 Supplemental cash flow information related to our leases was as follows: Three Months Ended March 31, 2021 2020 Cash paid for amounts included in the measurement of operating lease liabilities $ 2,423 $ 1,927 Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,773 $ 906 The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2021 $ 5,970 $ 6,736 2022 7,853 5,178 2023 6,510 3,676 2024 5,439 2,565 2025 4,431 2,213 Thereafter 32,565 21,866 Total minimum lease payments 62,768 42,234 Less: interest 19,370 18,762 Present value of lease liabilities $ 43,398 $ 23,472 We have a future lease commitment for a certain ground lease which does not yet meet the criteria for recording a ROU asset or ROU liability. The net present value of this commitment totals $3,000 as of March 31, 2021 and relates to a one-time payment due when specific criteria are met, which we estimate will be during the three months ended September 30, 2021. Sale-leasebacks We entered into a fifth amendment dated March 22, 2021 to our August 2018 agreement and increased the maximum funding amount from $150,000 up to $350,000 and extended the end date of the agreement from May 23, 2021 to March 31, 2022. We sold and leased back one energy asset for $1,087 in cash under this facility during the three months ended March 31, 2021. As of March 31, 2021, approximately $310,618 remained available under this lending commitment. These transactions are accounted for as failed sales and are classified as long-term financing facilities. See Note 7 for additional information. Net gains from amortization expense in cost of revenues related to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $55 for the three months ended March 31, 2021 and 2020, respectively.
LeasesLEASES The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: March 31, 2021 December 31, 2020 Operating Leases: Operating lease assets $ 41,484 $ 39,151 Current portions of operating lease liabilities $ 5,680 6,106 Long-term portions of operating lease liabilities 37,718 35,300 Total operating lease liabilities $ 43,398 $ 41,406 Weighted-average remaining lease term 12 years 12 years Weighted-average discount rate 5.81 % 5.94 % Financing Leases: Energy assets $ 33,473 $ 34,005 Current portions of financing lease liabilities $ 4,273 4,273 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 19,199 19,227 Total financing lease liabilities $ 23,472 $ 23,500 Weighted-average remaining lease term 16 years 16 years Weighted-average discount rate 11.93 % 11.94 % The costs related to our leases were as follows: Three Months Ended March 31, 2021 2020 Operating Leases: Operating lease costs $ 2,153 $ 1,826 Financing Leases: Amortization expense 532 532 Interest on lease liabilities 658 801 Total lease costs $ 3,343 $ 3,159 Supplemental cash flow information related to our leases was as follows: Three Months Ended March 31, 2021 2020 Cash paid for amounts included in the measurement of operating lease liabilities $ 2,423 $ 1,927 Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,773 $ 906 The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2021 $ 5,970 $ 6,736 2022 7,853 5,178 2023 6,510 3,676 2024 5,439 2,565 2025 4,431 2,213 Thereafter 32,565 21,866 Total minimum lease payments 62,768 42,234 Less: interest 19,370 18,762 Present value of lease liabilities $ 43,398 $ 23,472 We have a future lease commitment for a certain ground lease which does not yet meet the criteria for recording a ROU asset or ROU liability. The net present value of this commitment totals $3,000 as of March 31, 2021 and relates to a one-time payment due when specific criteria are met, which we estimate will be during the three months ended September 30, 2021. Sale-leasebacks We entered into a fifth amendment dated March 22, 2021 to our August 2018 agreement and increased the maximum funding amount from $150,000 up to $350,000 and extended the end date of the agreement from May 23, 2021 to March 31, 2022. We sold and leased back one energy asset for $1,087 in cash under this facility during the three months ended March 31, 2021. As of March 31, 2021, approximately $310,618 remained available under this lending commitment. These transactions are accounted for as failed sales and are classified as long-term financing facilities. See Note 7 for additional information. Net gains from amortization expense in cost of revenues related to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $55 for the three months ended March 31, 2021 and 2020, respectively.
LeasesLEASES The table below sets forth supplemental condensed consolidated balance sheet information related to our leases: March 31, 2021 December 31, 2020 Operating Leases: Operating lease assets $ 41,484 $ 39,151 Current portions of operating lease liabilities $ 5,680 6,106 Long-term portions of operating lease liabilities 37,718 35,300 Total operating lease liabilities $ 43,398 $ 41,406 Weighted-average remaining lease term 12 years 12 years Weighted-average discount rate 5.81 % 5.94 % Financing Leases: Energy assets $ 33,473 $ 34,005 Current portions of financing lease liabilities $ 4,273 4,273 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 19,199 19,227 Total financing lease liabilities $ 23,472 $ 23,500 Weighted-average remaining lease term 16 years 16 years Weighted-average discount rate 11.93 % 11.94 % The costs related to our leases were as follows: Three Months Ended March 31, 2021 2020 Operating Leases: Operating lease costs $ 2,153 $ 1,826 Financing Leases: Amortization expense 532 532 Interest on lease liabilities 658 801 Total lease costs $ 3,343 $ 3,159 Supplemental cash flow information related to our leases was as follows: Three Months Ended March 31, 2021 2020 Cash paid for amounts included in the measurement of operating lease liabilities $ 2,423 $ 1,927 Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,773 $ 906 The table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2021 $ 5,970 $ 6,736 2022 7,853 5,178 2023 6,510 3,676 2024 5,439 2,565 2025 4,431 2,213 Thereafter 32,565 21,866 Total minimum lease payments 62,768 42,234 Less: interest 19,370 18,762 Present value of lease liabilities $ 43,398 $ 23,472 We have a future lease commitment for a certain ground lease which does not yet meet the criteria for recording a ROU asset or ROU liability. The net present value of this commitment totals $3,000 as of March 31, 2021 and relates to a one-time payment due when specific criteria are met, which we estimate will be during the three months ended September 30, 2021. Sale-leasebacks We entered into a fifth amendment dated March 22, 2021 to our August 2018 agreement and increased the maximum funding amount from $150,000 up to $350,000 and extended the end date of the agreement from May 23, 2021 to March 31, 2022. We sold and leased back one energy asset for $1,087 in cash under this facility during the three months ended March 31, 2021. As of March 31, 2021, approximately $310,618 remained available under this lending commitment. These transactions are accounted for as failed sales and are classified as long-term financing facilities. See Note 7 for additional information. Net gains from amortization expense in cost of revenues related to deferred gains and losses in connection with our sale-leaseback agreements were $57 and $55 for the three months ended March 31, 2021 and 2020, respectively.

Debt and Financing Lease Liabil

Debt and Financing Lease Liabilities3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]
Debt and Financing Lease LiabilitiesDEBT AND FINANCING LEASE LIABILITIES Our debt and financing lease liabilities comprised of the following: March 31, 2021 December 31, 2020 Senior secured revolving credit facility (1) $ — $ 53,073 Senior secured term loan 56,469 57,688 Non-recourse term loans 204,885 198,124 Non-recourse construction revolvers 35,757 26,758 Long-term financing facilities (2) 29,989 32,618 Financing lease liabilities (3) 23,472 23,500 Total debt and financing lease liabilities 350,572 391,761 Less: current maturities 71,770 69,362 Less: unamortized discount and debt issuance costs 10,391 10,725 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs $ 268,411 $ 311,674 (1) At March 31, 2021, funds of $101,241 are available for borrowing under this facility. (2) These facilities are sale-leaseback arrangements and are accounted for as failed sales. See Note 6 for additional disclosures. (3) Financing lease liabilities are sale-leaseback arrangements under previous guidance. See Note 6 for additional disclosures. Senior Secured Revolving Credit Facility We repaid in full the outstanding balances under our senior secured revolving credit facility. See Note 14 for additional information. October 2020 Term Loan Modification In October 2020, we entered into an amended and restated credit agreement with a bank primarily to increase the commitments under the existing credit agreement and add projects eligible for financing. The new credit agreement increased the commitment from $28,500 to $35,000 and included an option for the lender to increase the commitment by up to an additional $15,000 for a total not to exceed $50,000. During the three months ended March 31, 2021, the lender increased its commitment by the remaining $15,000 and we received net proceeds of $14,848. The quarterly payments consist of $1,250 in principal plus an additional principal prepayment based on project cash flows in addition to interest to be paid through the earlier of maturity, March 2026, or when the principal balance is paid in full. We accounted for this amendment as a modification and at closing we incurred $150 in lender’s fees which were reflected as debt discount and $2 in third-party fees which were expensed in selling, general and administrative expenses during the three months ended March 31, 2021. The unamortized discount and debt issuance costs from the October 2020 loan modification are being amortized over the remaining term of the agreement. The balance of the loan outstanding as of March 31, 2021 was $48,547, net of unamortized discount and debt issuance costs. June 2020 Construction Revolver In June 2020, we entered into a revolving credit agreement with a bank, with an aggregate borrowing capacity of $100,000 for use in financing the construction cost of our owned projects. In March 2021, we entered into a third amendment to this agreement to extend this facility from May 2021 to March 2022. All remaining unpaid amounts outstanding under the facility are due at that time. During the three months ended March 31, 2021, we closed on $14,013 in funding for four additional projects under this facility and drew down an additional $711 for an existing project. The balance of this construction revolver as of March 31, 2021 was $29,460, net of unamortized debt issuance costs and funds of $70,099 are available for borrowing under this facility.

Income Taxes

Income Taxes3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]
Income TaxesINCOME TAXES We recorded a provision (benefit) for income taxes of $2,205 and $(2,503) for the three months ended March 31, 2021 and 2020, respectively. The estimated effective annualized tax rate impacted by the period discrete items is 15.1% for the three months ended March 31, 2021, compared to a (60.6)% of estimated effective annualized tax rate for the three months ended March 31, 2020. The principal reasons for the difference between the statutory rate and the estimated annual effective rate for 2021 were the effects of investment tax credits which we are entitled from solar plants placed into service or are forecasted to be placed into service during 2021, the tax deductions related to the Section 179D deduction, the deduction of compensation expense associated with certain employee stock options, and tax basis adjustments on certain partnership flip transactions. The principal reason for the difference between the statutory rate and the estimated annual effective rate for 2020 were the effects of investment tax credits to which we are entitled from solar plants which were placed into service during 2020, tax deductions related to the Section 179D deduction, tax basis adjustments on certain partnership flip transactions, and tax rate benefits associated with the net operating loss carryback made possible by the passing of the COVID-19 CARES Act on March 27, 2020. The following table sets forth the total amounts of gross unrecognized tax benefits: Gross Unrecognized Balance, December 31, 2020 $ 600 Balance, March 31, 2021 $ 600 The amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods was $190 as of March 31, 2021 and December 31, 2020 (net of the federal benefit on state amounts). We presented all deferred tax assets and liabilities as noncurrent, net liabilities on our condensed consolidated balance sheets as of March 31, 2021, and December 31, 2020.

Commitments and Contingencies

Commitments and Contingencies3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and ContingenciesCOMMITMENTS AND CONTINGENCIES From time to time, we issue letters of credit and performance bonds with our third-party lenders, to provide collateral. Legal Proceedings On November 6, 2017, we were served with a complaint filed by a customer against nine contractors, including us, claiming both physical damages to the customer’s tangible property and damages caused by various alleged defects in the design of the project through negligent acts and/or omissions, breaches of contract and breaches of the “implied warranty of good and workmanlike manner.” A mediation was held in January 2021, at which time we made an offer to settle the case, in an amount which we believe would be covered by our insurance. Although the customer rejected our offer, both parties have agreed to continue to negotiate a settlement. We believe that it is probable that a loss will be incurred and, therefore, have accrued a reasonable estimate of the loss, which is included in accrued expenses and other current liabilities in our consolidated balance sheets as of December 31, 2020 and March 31, 2021. In addition, we accrued a loss recovery from insurance proceeds as we believe the receipt of such proceeds is probable. The loss recovery accrual is included in prepaid expenses and other current assets in our consolidated balance sheets as of December 31, 2020 and March 31, 2021. There were no changes to our estimate during the three months ended March 31, 2021. We are involved in a variety of other claims and other legal proceedings generally incidental to our normal business activities. While the outcome of any of these proceedings cannot be accurately predicted, we do not believe the ultimate resolution of any of these existing matters would have a material adverse effect on our financial condition or results of operations. Commitment as a Result of an Acquisition In August 2018, we completed an acquisition which provided for a revenue earn-out contingent upon the acquired business meeting certain cumulative revenue targets over 5 years from the acquisition date. The fair value was $678 as of March 31, 2021 and December 31, 2020 and is included in other liabilities on the condensed consolidated balance sheets. The contingent

Fair Value Measurement

Fair Value Measurement3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value MeasurementFAIR VALUE MEASUREMENT We recognize our financial assets and liabilities at fair value on a recurring basis (at least annually). Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Three levels of inputs that may be used to measure fair value are as follows: Level 1: Inputs are based on unadjusted quoted prices for identical instruments traded in active markets. Level 2: Inputs are based on quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3: Inputs are generally unobservable and typically reflect management’s estimates of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques that include option pricing models, discounted cash flow models, and similar techniques. The following table presents the input level used to determine the fair values of our financial instruments measured at fair value on a recurring basis: Fair Value as of Level March 31, 2021 December 31, 2020 Assets: Interest rate swap instruments 2 $ 1,290 $ 2 Commodity swap instruments 2 115 363 Total assets $ 1,405 $ 365 Liabilities: Interest rate swap instruments 2 $ 7,202 $ 10,073 Make-whole provisions 2 1,112 412 Contingent consideration 3 678 678 Total liabilities $ 8,992 $ 11,163 The fair value of our long-term debt was estimated using discounted cash flows analysis, based on our current incremental borrowing rates for similar types of borrowing arrangements which are considered to be level two inputs. There have been no transfers in or out of level two or three financial instruments for the three months ended March 31, 2021 and the year ended December 31, 2020. The following table sets forth the fair value and the carrying value of our long-term debt, excluding financing leases: As of March 31, 2021 As of December 31, 2020 Fair Value Carrying Value Fair Value Carrying Value Long-term debt (Level 2) $ 320,279 $ 316,709 $ 363,460 $ 357,536 We are also required to periodically measure certain other assets at fair value on a nonrecurring basis, including long-lived assets, goodwill and other intangible assets. We calculated the fair value used in our annual goodwill impairment analysis utilizing a discounted cash flow analysis and determined that the inputs used were level 3 inputs. There were no assets recorded at fair value on a non-recurring basis as of March 31, 2021 or December 31, 2020.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities3 Months Ended
Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging ActivitiesDERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES The following table presents information about the fair value amounts of our cash flow derivative instruments: Derivatives as of March 31, 2021 December 31, 2020 Balance Sheet Location Fair Value Fair Value Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other liabilities $ 7,157 $ 9,994 Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other assets $ 1,290 $ 2 Interest rate swap contracts Other liabilities $ 45 $ 79 Commodity swap contracts Other assets $ 115 $ 363 Make-whole provisions Other liabilities $ 1,112 $ 412 As of March 31, 2021 and December 31, 2020, all but five of our freestanding derivatives were designated as hedging instruments. The following table presents information about the effects of our derivative instruments on our condensed consolidated statements of income and condensed consolidated statements of comprehensive income: Amount of (Gain) Loss Recognized in Net Income Location of (Gain) Loss Recognized in Net Income Three Months Ended March 31, 2021 2020 Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ 523 $ 99 Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ (1,322) $ 10 Commodity swap contracts Other expenses, net $ 248 $ (48) Make-whole provisions Other expenses, net $ 697 $ (185) The following table presents the changes in AOCI, net of taxes, from our hedging instruments: Three Months Ended March 31, 2021 Derivatives Designated as Hedging Instruments: Accumulated loss in AOCI at the beginning of the period $ (7,526) Unrealized gain recognized in AOCI 1,595 Loss reclassified from AOCI to other expenses, net 523 Net gain on derivatives 2,118 Accumulated loss in AOCI at the end of the period $ (5,408) The following tables present all of our active derivative instruments as of March 31, 2021: Active Interest Rate Swaps Effective Date Expiration Date Initial Notional Status 11-Year, 5.77% Fixed October 2018 October 2029 $ 9,200 Designated 15-Year, 5.24% Fixed June 2018 June 2033 $ 10,000 Designated 10-Year, 4.74% Fixed June 2017 December 2027 $ 14,100 Designated 15-Year, 3.26% Fixed February 2023 December 2038 $ 14,084 Designated 7-Year, 2.19% Fixed February 2016 February 2023 $ 20,746 Designated 8-Year, 3.70% Fixed March 2020 June 2028 $ 14,643 Designated 8-Year, 3.70% Fixed March 2020 June 2028 $ 10,734 Designated 13-Year, 0.93% Fixed May 2020 March 2033 $ 9,505 Not Designated 13-Year, 0.93% Fixed May 2020 March 2033 $ 6,968 Not Designated 15.5-Year, 5.40% Fixed September 2008 March 2024 $ 13,081 Designated 2.75-Year, 0.41% Fixed December 2020 September 2023 $ 26,250 Not Designated Active Commodity Swaps Effective Date Expiration Date Initial Notional Amount (Volume) Commodity Measurement Status 1-Year, $2.70 MMBtu Fixed May 2020 April 2021 435,810 MMBtus Not Designated 3.5-Year, $2.65 MMBtu Fixed December 2020 June 2024 3,296,160 MMBtus Not Designated Other Derivatives Classification Effective Date Expiration Date Fair Value ($) Make-whole provisions Liability June/August 2018 December 2038 $ 706 Make-whole provisions Liability August 2016 April 2031 $ 115 Make-whole provisions Liability April 2017 February 2034 $ 119 Make-whole provisions Liability November 2020 December 2027 $ 117 Make-whole provisions Liability October 2011 May 2028 $ 55

Investment Funds and Equity Met

Investment Funds and Equity Method Investments3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Investment Funds and Equity Method InvestmentsINVESTMENT FUNDS AND EQUITY METHOD INVESTMENTS Investment Funds The table below presents a summary of amounts related to our investment funds, which we determined meet the definition of a variable interest entity (“VIE”) as of: March 31, December 31, 2021 (1) 2020 (1) Cash and cash equivalents $ 5,691 $ 5,828 Restricted cash 2,438 3,185 Accounts receivable, net 592 834 Costs and estimated earnings in excess of billings 1,331 968 Prepaid expenses and other current assets 90 120 Total VIE current assets 10,142 10,935 Property and equipment, net 1,266 1,266 Energy assets, net 140,881 143,133 Operating lease assets 6,394 6,439 Other assets 453 425 Total VIE assets $ 159,136 $ 162,198 Current portions of long-term debt and financing lease liabilities $ 2,215 $ 2,230 Accounts payable 150 311 Accrued expenses and other current liabilities 466 1,092 Current portions of operating lease liabilities 130 125 Total VIE current liabilities 2,961 3,758 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 22,391 22,822 Long-term operating lease liabilities, net of current portion 6,195 6,220 Other liabilities 1,067 535 Total VIE liabilities $ 32,614 $ 33,335 (1) The amounts in the above table are reflected in Note 1 on our condensed consolidated balance sheets. See Note 13 for additional information on the call and put options. Equity Method Investments Unconsolidated joint ventures are accounted for under the equity method. For these joint ventures, our investment balances are included in other assets on the condensed consolidated balance sheets and our pro rata share of net income or loss is included in operating income. The following table provides information about our equity method investments in joint ventures: As of March 31, 2021 December 31, 2020 Equity method investments $ 1,068 $ 1,189 Three Months Ended March 31, March 31, 2021 March 31, 2020 Expense recognized $ 62 $ 53

Redeemable Non-controlling Inte

Redeemable Non-controlling Interests3 Months Ended
Mar. 31, 2021
Noncontrolling Interest [Abstract]
Redeemable Non-controlling InterestsREDEEMABLE NON-CONTROLLING INTERESTS Our subsidiaries with membership interests in the investment funds we formed have the right to elect to require the non-controlling interest holder to sell all of its membership units to our subsidiaries, a call option. Our investment funds also include rights for the non-controlling interest holder to elect to require our subsidiaries to purchase all of the non-controlling membership interests in the fund, a put option. The call options are exercisable beginning on the date that specified conditions are met for each respective fund. The call option period for one of our investment funds began in March 2021. The put options for the investment funds are exercisable beginning on the date that specified conditions are met for each respective fund. We initially record our redeemable non-controlling interests at fair value on the date of acquisition and subsequently adjust to redemption value. At both March 31, 2021 and December 31, 2020 redeemable non-controlling interests were reported at their carrying values, as the carrying value at each reporting period was greater than the estimated redemption value.

Equity and Earnings Per Share

Equity and Earnings Per Share3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]
Equity and Earnings Per ShareEQUITY AND EARNINGS PER SHARE Equity Offering On March 9, 2021, we closed on an underwritten public offering of 2,500 shares of our Class A common stock at a public offering price of $44.00 per share. Net proceeds from the offering were $104,458, after deducting offering costs of $5,542. On March 15, 2021, we closed on the underwriters’ option to purchase 375 additional shares of Class A common stock from us, resulting in net proceeds of $15,758 after deducting offering costs of $742. We used $80,000 of the net proceeds to repay in full the outstanding U.S. dollar balance under our senior secured revolving credit facility. In the offering, selling shareholders sold 805 shares our Class A Common Stock at a public offering price of $44.00 per share, less the underwriting discount. We did not receive any proceeds from the sale of the shares by the selling stockholders. Earnings Per Share The following is a reconciliation of the numerator and denominator for the computation of basic and diluted earnings per share: Three Months Ended March 31, (In thousands, except per share data) 2021 2020 Numerator: Net income attributable to common shareholders $ 11,174 $ 6,201 Adjustment for accretion of tax equity financing fees (31) — Income attributable to common shareholders $ 11,143 $ 6,201 Denominator: Basic weighted-average shares outstanding 48,975 47,384 Effect of dilutive securities: Stock options 1,382 1,113 Diluted weighted-average shares outstanding 50,357 48,497 Net income per share attributable to common shareholders: Basic $ 0.23 $ 0.13 Diluted $ 0.22 $ 0.13 Potentially dilutive shares (1) 1,157 431 (1) Potentially dilutive shares attributable to stock options were excluded from the computation of diluted earnings per share as the effect would have been anti-dilutive.

Stock-Based Compensation

Stock-Based Compensation3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock-Based CompensationSTOCK-BASED COMPENSATION We recorded stock-based compensation expense, including expense related to our employee stock purchase plan, as follows: Three Months Ended March 31, 2021 2020 Stock-based compensation expense $ 766 $ 429 Our compensation expense is included in selling, general and administrative expenses in the condensed consolidated statements of income. As of March 31, 2021, there was $26,077 of unrecognized compensation expense related to non-vested stock option awards that is expected to be recognized over a weighted-average period of 3.0 years. Stock Option Grants During the three months ended March 31, 2021, we granted 694 common stock options to certain employees under our 2020 Stock Incentive Plan, which have a contractual life of ten years and vest over a five-year period. We did not grant awards to individuals who were not either an employee or director of ours during the three months ended March 31, 2021 or during the year ended December 31, 2020.

Business Segment Information

Business Segment Information3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]
Business Segment InformationBUSINESS SEGMENT INFORMATION Our reportable segments for the three months ended March 31, 2021 are U.S. Regions, U.S. Federal, Canada and Non-Solar Distributed Generation (“Non-Solar DG”). We changed the structure of our internal organization and our U.S. Regions segment now includes our U.S.-based enterprise energy management services previously included in our “All Other” segment. As a result, previously reported amounts have been restated for comparative purposes. Our U.S. Regions, U.S. Federal and Canada segments offer energy efficiency products and services which include the design, engineering and installation of equipment and other measures to improve the efficiency and control the operation of a facility’s energy infrastructure, renewable energy solutions and services and the development and construction of small-scale plants that Ameresco owns or develops for customers that produce electricity, gas, heat or cooling from renewable sources of energy and O&M services. Our Non-Solar DG segment sells electricity, processed renewable gas fuel, heat or cooling, produced from renewable sources of energy, other than solar, and generated by small-scale plants that we own and O&M services for customer-owned small-scale plants. The “All Other” category includes enterprise energy management services, other than the U.S.-based portion; consulting services, energy efficiency products and services outside of the U.S. and Canada; and the sale of solar PV energy products and systems which we refer to as integrated-PV. These segments do not include results of other activities, such as corporate operating expenses not specifically allocated to the segments. Certain reportable segments are an aggregation of operating segments. The accounting policies are the same as those described in the summary of significant accounting policies in Note 2 included in our 2020 Form 10-K . The table below presents our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements: U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Consolidated Three Months Ended March 31, 2021 Revenues $ 85,273 $ 102,214 $ 11,643 $ 30,368 $ 22,704 $ 252,202 Interest income (1) 34 2 — 1,074 — 1,110 Interest expense 2,009 324 386 610 143 3,472 Depreciation and amortization of intangible assets 3,575 1,010 415 4,862 287 10,149 Unallocated corporate activity — — — — — (11,160) Income (loss) before taxes, excluding unallocated corporate activity 3,510 12,030 (85) 8,628 1,713 25,796 Three Months Ended March 31, 2020 Revenues $ 85,840 $ 68,745 $ 11,392 $ 22,724 $ 23,712 $ 212,413 Interest income (1) 221 40 — 53 — 314 Interest expense 1,665 746 172 1,083 15 3,681 Depreciation and amortization of intangible assets 2,862 1,017 391 5,287 277 9,834 Unallocated corporate activity — — — — — (10,317) Income (loss) before taxes, excluding unallocated corporate activity 4,038 7,094 (221) 1,669 1,870 14,450 (1) Includes gains recognized on derivative instruments. See Note 11 for additional information. See Note 3 for additional information about our revenues by product line.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]
Basis of PresentationBASIS OF PRESENTATIONThe accompanying condensed consolidated financial statements of Ameresco, Inc. (including its subsidiaries, the “Company,” “Ameresco,” “we,” “our,” or “us”) are unaudited, according to certain rules and regulations of the Securities and Exchange Commission, and include, in our opinion, normal recurring adjustments necessary for a fair presentation in conformity with accounting principles generally accepted in the United States (“GAAP”) of the results for the periods indicated.
ReclassificationReclassification Certain prior period amounts were reclassified to conform to the presentation in the current period.
Recent Accounting PronouncementsRecent Accounting Pronouncements Income Taxes In December 2019, the FASB issued ASU No. 2019-12, Simplifying the Accounting for Income Taxes, which simplifies the accounting for income taxes, eliminates certain exceptions within ASC 740, Income Taxes, and clarifies certain aspects of the current guidance to promote consistency among reporting entities. ASU 2019-12 is effective for our fiscal year beginning after December 15, 2020. We adopted this guidance as of January 1, 2021 and the adoption did not have an impact on our condensed consolidated financial statements. Reference Rate Reform In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting. ASU 2020-04, which provides optional guidance for a limited period of time to ease the potential burden in accounting for (or recognizing the effects of) reference rate reform on financial reporting. Companies can apply the ASU immediately, however, the guidance will only be available until December 31, 2022. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements and related disclosures. In January 2021, the FASB issued ASU 2021-01, Reference Rate Reform (Topic 848): Scope. The amendments in ASU 2021-01 provide optional expedients to the current guidance on contract modification and hedge accounting from the expected market transition from LIBOR and other interbank offered rates to alternative reference rates. The guidance generally can be applied to applicable contract modifications through December 31, 2022. We are currently evaluating the impact that adopting this new accounting standard would have on our condensed consolidated financial statements and related disclosures. Codification Improvements In October 2020, the FASB issued ASU 2020-10 Codification Improvements. The amendments in this ASU represent changes to clarify the Accounting Standard Codifications, correct unintended application of guidance, or make minor improvements to the ASC that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. ASU 2020-10 is effective for annual periods beginning after December 15, 2020 and interim periods within those annual periods, with early adoption permitted. The amendments in this ASU should be applied retrospectively. We adopted this guidance as of January 1, 2021 and the adoption did not have an impact on our condensed consolidated financial statements.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)3 Months Ended
Mar. 31, 2021
Accounting Policies [Abstract]
Summary of Accounts Receivable, Allowance for Credit LossChanges in the allowance for credit losses are as follows: March 31, 2021 March 31, 2020 Allowance for credit losses, beginning of period $ 2,266 $ 2,260 Charges to costs and expenses, net 3 49 Account write-offs and other 41 (189) Allowance for credit losses, end of period $ 2,310 $ 2,120

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Summary of Disaggregation of RevenueThe following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2021: U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Project revenue $ 71,158 $ 90,089 $ 9,001 $ 4,654 $ 5,791 $ 180,693 O&M revenue 4,310 11,440 26 2,637 71 18,484 Energy assets 8,810 664 747 22,931 135 33,287 Integrated-PV — — — — 9,154 9,154 Other 995 21 1,869 146 7,553 10,584 Total revenues $ 85,273 $ 102,214 $ 11,643 $ 30,368 $ 22,704 $ 252,202 The following table presents our revenue disaggregated by line of business and reportable segment for the three months ended March 31, 2020: U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Project revenue $ 71,493 $ 56,114 $ 8,864 $ 2,371 $ 5,587 $ 144,429 O&M revenue 4,352 11,626 9 2,015 60 18,062 Energy assets 8,854 719 663 17,986 — 28,222 Integrated-PV — — — — 11,469 11,469 Other 1,141 286 1,856 352 6,596 10,231 Total revenues $ 85,840 $ 68,745 $ 11,392 $ 22,724 $ 23,712 $ 212,413 For the three months ended March 31, 2021 and 2020, approximately 94% and 91%, respectively, of revenue is recognized over time, and the remainder is for products and services transferred at a point in time. We attribute revenues to customers based on the location of the customer. The following table presents information related to our revenues by geographic area: Three Months Ended March 31, 2021 2020 United States $ 234,009 $ 195,939 Canada 10,853 10,553 Other 7,340 5,921 Total revenues $ 252,202 $ 212,413
Summary of Contract with Customer, Asset and LiabilityThe following tables provide information about receivables, contract assets and contract liabilities from contracts with customers: March 31, 2021 December 31, 2020 Accounts receivable, net $ 113,095 $ 125,010 Accounts receivable retainage, net $ 32,071 $ 30,189 Contract Assets: Costs and estimated earnings in excess of billings $ 179,474 $ 185,960 Contract Liabilities: Billings in excess of cost and estimated earnings $ 30,211 $ 33,984 Billings in excess of cost and estimated earnings, non-current (1) 6,590 6,631 Total contract liabilities $ 36,801 $ 40,615 March 31, 2020 December 31, 2019 Accounts receivable, net $ 110,742 $ 95,863 Accounts receivable retainage, net $ 21,265 $ 16,976 Contract Assets: Costs and estimated earnings in excess of billings $ 189,566 $ 202,243 Contract Liabilities: Billings in excess of cost and estimated earnings $ 25,350 $ 26,618 Billings in excess of cost and estimated earnings, non-current (1) 5,320 5,560 Total contract liabilities $ 30,670 $ 32,178 (1) Performance obligations are expected to be completed beyond the next twelve months and are included in other liabilities in the condensed consolidated balance sheets.

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets, Net (Tables)3 Months Ended
Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Value of Goodwill Attributable to Each Reportable SegmentThe changes in the carrying value of goodwill balances by reportable segment was as follows: U.S. Regions U.S. Federal Canada Non-solar DG Other Total Balance, December 31, 2020 $ 26,705 $ 3,981 $ 3,441 $ — $ 24,587 $ 58,714 Currency effects — — 41 — 57 98 Balance, March 31, 2021 $ 26,705 $ 3,981 $ 3,482 $ — $ 24,644 $ 58,812
Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible AssetsDefinite-lived intangible assets, net consisted of the following: As of March 31, 2021 As of December 31, 2020 Gross carrying amount $ 27,240 27,240 Accumulated amortization 26,393 26,313 Intangible assets, net $ 847 $ 927
Schedule of Amortization ExpenseThe table below sets forth amortization expense: Three Months Ended March 31, Asset type Location 2021 2020 Customer contracts Cost of revenues $ — $ 22 All other intangible assets Selling, general and administrative expenses 80 157 Total amortization expense $ 80 $ 179

Energy Assets, Net (Tables)

Energy Assets, Net (Tables)3 Months Ended
Mar. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Energy AssetsEnergy assets, net consisted of the following: March 31, 2021 December 31, 2020 Energy assets (1) $ 1,000,085 $ 954,426 Less - accumulated depreciation and amortization (234,963) (225,048) Energy assets, net $ 765,122 $ 729,378 (1) Includes financing lease assets (see Note 6), capitalized interest and ARO assets (see tables below).
Schedule of Depreciation and Amortization Expense of Energy AssetsThe following table sets forth our depreciation and amortization expense on energy assets, net of deferred grant amortization: Three Months Ended March 31, Location 2021 2020 Cost of revenues (2) $ 9,686 $ 9,299 (2) Includes depreciation and amortization on financing lease assets (see Note 6).
Schedule of Capitalized InterestThe following table presents the interest costs relating to construction financing during the period of construction, which were capitalized as part of energy assets, net: Three Months Ended March 31, 2021 2020 Capitalized interest $ 2,238 $ 862
Schedule Of Asset And Liabilities Retirement ObligationsThe following tables sets forth information related to our ARO assets and ARO liabilities: Location March 31, 2021 December 31, 2020 ARO assets, net Energy assets, net $ 2,032 $ 1,468 ARO liabilities, current Accrued expenses and other current liabilities $ 6 $ 86 ARO liabilities, non-current Other liabilities 2,251 1,561 Total ARO liabilities $ 2,257 $ 1,647 Three Months Ended March 31, 2021 2020 Depreciation expense of ARO assets $ 23 $ 19 Accretion expense of ARO liabilities $ 24 $ 21

Leases (Tables)

Leases (Tables)3 Months Ended
Mar. 31, 2021
Leases [Abstract]
Schedule of Assets and Liabilities, LesseeThe table below sets forth supplemental condensed consolidated balance sheet information related to our leases: March 31, 2021 December 31, 2020 Operating Leases: Operating lease assets $ 41,484 $ 39,151 Current portions of operating lease liabilities $ 5,680 6,106 Long-term portions of operating lease liabilities 37,718 35,300 Total operating lease liabilities $ 43,398 $ 41,406 Weighted-average remaining lease term 12 years 12 years Weighted-average discount rate 5.81 % 5.94 % Financing Leases: Energy assets $ 33,473 $ 34,005 Current portions of financing lease liabilities $ 4,273 4,273 Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 19,199 19,227 Total financing lease liabilities $ 23,472 $ 23,500 Weighted-average remaining lease term 16 years 16 years Weighted-average discount rate 11.93 % 11.94 %
Schedule of Other Lease Cost DetailsThe costs related to our leases were as follows: Three Months Ended March 31, 2021 2020 Operating Leases: Operating lease costs $ 2,153 $ 1,826 Financing Leases: Amortization expense 532 532 Interest on lease liabilities 658 801 Total lease costs $ 3,343 $ 3,159 Supplemental cash flow information related to our leases was as follows: Three Months Ended March 31, 2021 2020 Cash paid for amounts included in the measurement of operating lease liabilities $ 2,423 $ 1,927 Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,773 $ 906
Schedule of Operating Lease Liability MaturityThe table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2021 $ 5,970 $ 6,736 2022 7,853 5,178 2023 6,510 3,676 2024 5,439 2,565 2025 4,431 2,213 Thereafter 32,565 21,866 Total minimum lease payments 62,768 42,234 Less: interest 19,370 18,762 Present value of lease liabilities $ 43,398 $ 23,472
Schedule of Finance Lease Liability MaturityThe table below sets forth our estimated minimum future lease obligations under our leases: Operating Leases Financing Leases Year ended December 31, 2021 $ 5,970 $ 6,736 2022 7,853 5,178 2023 6,510 3,676 2024 5,439 2,565 2025 4,431 2,213 Thereafter 32,565 21,866 Total minimum lease payments 62,768 42,234 Less: interest 19,370 18,762 Present value of lease liabilities $ 43,398 $ 23,472

Debt and Financing Lease Liab_2

Debt and Financing Lease Liabilities (Tables)3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]
Schedule of Long-term Debt InstrumentsOur debt and financing lease liabilities comprised of the following: March 31, 2021 December 31, 2020 Senior secured revolving credit facility (1) $ — $ 53,073 Senior secured term loan 56,469 57,688 Non-recourse term loans 204,885 198,124 Non-recourse construction revolvers 35,757 26,758 Long-term financing facilities (2) 29,989 32,618 Financing lease liabilities (3) 23,472 23,500 Total debt and financing lease liabilities 350,572 391,761 Less: current maturities 71,770 69,362 Less: unamortized discount and debt issuance costs 10,391 10,725 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs $ 268,411 $ 311,674 (1) At March 31, 2021, funds of $101,241 are available for borrowing under this facility. (2) These facilities are sale-leaseback arrangements and are accounted for as failed sales. See Note 6 for additional disclosures. (3) Financing lease liabilities are sale-leaseback arrangements under previous guidance. See Note 6 for additional disclosures.

Income Taxes (Tables)

Income Taxes (Tables)3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]
Reconciliation of Gross Unrecognized Tax BenefitsThe following table sets forth the total amounts of gross unrecognized tax benefits: Gross Unrecognized Balance, December 31, 2020 $ 600 Balance, March 31, 2021 $ 600

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)3 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]
Summary of Changes in Fair Value by Balance Sheet GroupingFair Value as of Level March 31, 2021 December 31, 2020 Assets: Interest rate swap instruments 2 $ 1,290 $ 2 Commodity swap instruments 2 115 363 Total assets $ 1,405 $ 365 Liabilities: Interest rate swap instruments 2 $ 7,202 $ 10,073 Make-whole provisions 2 1,112 412 Contingent consideration 3 678 678 Total liabilities $ 8,992 $ 11,163
Fair Value and Carrying Value of Long-Term DebtAs of March 31, 2021 As of December 31, 2020 Fair Value Carrying Value Fair Value Carrying Value Long-term debt (Level 2) $ 320,279 $ 316,709 $ 363,460 $ 357,536

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)3 Months Ended
Mar. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative InstrumentsThe following table presents information about the fair value amounts of our cash flow derivative instruments: Derivatives as of March 31, 2021 December 31, 2020 Balance Sheet Location Fair Value Fair Value Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other liabilities $ 7,157 $ 9,994 Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other assets $ 1,290 $ 2 Interest rate swap contracts Other liabilities $ 45 $ 79 Commodity swap contracts Other assets $ 115 $ 363 Make-whole provisions Other liabilities $ 1,112 $ 412
Schedule of Derivative Effect on Consolidated Statement of Income (Loss)The following table presents information about the effects of our derivative instruments on our condensed consolidated statements of income and condensed consolidated statements of comprehensive income: Amount of (Gain) Loss Recognized in Net Income Location of (Gain) Loss Recognized in Net Income Three Months Ended March 31, 2021 2020 Derivatives Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ 523 $ 99 Derivatives Not Designated as Hedging Instruments: Interest rate swap contracts Other expenses, net $ (1,322) $ 10 Commodity swap contracts Other expenses, net $ 248 $ (48) Make-whole provisions Other expenses, net $ 697 $ (185)
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss)The following table presents the changes in AOCI, net of taxes, from our hedging instruments: Three Months Ended March 31, 2021 Derivatives Designated as Hedging Instruments: Accumulated loss in AOCI at the beginning of the period $ (7,526) Unrealized gain recognized in AOCI 1,595 Loss reclassified from AOCI to other expenses, net 523 Net gain on derivatives 2,118 Accumulated loss in AOCI at the end of the period $ (5,408)
Schedule of Active Derivative InstrumentsThe following tables present all of our active derivative instruments as of March 31, 2021: Active Interest Rate Swaps Effective Date Expiration Date Initial Notional Status 11-Year, 5.77% Fixed October 2018 October 2029 $ 9,200 Designated 15-Year, 5.24% Fixed June 2018 June 2033 $ 10,000 Designated 10-Year, 4.74% Fixed June 2017 December 2027 $ 14,100 Designated 15-Year, 3.26% Fixed February 2023 December 2038 $ 14,084 Designated 7-Year, 2.19% Fixed February 2016 February 2023 $ 20,746 Designated 8-Year, 3.70% Fixed March 2020 June 2028 $ 14,643 Designated 8-Year, 3.70% Fixed March 2020 June 2028 $ 10,734 Designated 13-Year, 0.93% Fixed May 2020 March 2033 $ 9,505 Not Designated 13-Year, 0.93% Fixed May 2020 March 2033 $ 6,968 Not Designated 15.5-Year, 5.40% Fixed September 2008 March 2024 $ 13,081 Designated 2.75-Year, 0.41% Fixed December 2020 September 2023 $ 26,250 Not Designated Active Commodity Swaps Effective Date Expiration Date Initial Notional Amount (Volume) Commodity Measurement Status 1-Year, $2.70 MMBtu Fixed May 2020 April 2021 435,810 MMBtus Not Designated 3.5-Year, $2.65 MMBtu Fixed December 2020 June 2024 3,296,160 MMBtus Not Designated Other Derivatives Classification Effective Date Expiration Date Fair Value ($) Make-whole provisions Liability June/August 2018 December 2038 $ 706 Make-whole provisions Liability August 2016 April 2031 $ 115 Make-whole provisions Liability April 2017 February 2034 $ 119 Make-whole provisions Liability November 2020 December 2027 $ 117 Make-whole provisions Liability October 2011 May 2028 $ 55

Investment Funds and Equity M_2

Investment Funds and Equity Method Investments (Tables)3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest EntitiesThe table below presents a summary of amounts related to our investment funds, which we determined meet the definition of a variable interest entity (“VIE”) as of: March 31, December 31, 2021 (1) 2020 (1) Cash and cash equivalents $ 5,691 $ 5,828 Restricted cash 2,438 3,185 Accounts receivable, net 592 834 Costs and estimated earnings in excess of billings 1,331 968 Prepaid expenses and other current assets 90 120 Total VIE current assets 10,142 10,935 Property and equipment, net 1,266 1,266 Energy assets, net 140,881 143,133 Operating lease assets 6,394 6,439 Other assets 453 425 Total VIE assets $ 159,136 $ 162,198 Current portions of long-term debt and financing lease liabilities $ 2,215 $ 2,230 Accounts payable 150 311 Accrued expenses and other current liabilities 466 1,092 Current portions of operating lease liabilities 130 125 Total VIE current liabilities 2,961 3,758 Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs 22,391 22,822 Long-term operating lease liabilities, net of current portion 6,195 6,220 Other liabilities 1,067 535 Total VIE liabilities $ 32,614 $ 33,335 (1) The amounts in the above table are reflected in Note 1 on our condensed consolidated balance sheets. See Note 13 for additional information on the call and put options.
Schedule of Equity Method InvestmentsThe following table provides information about our equity method investments in joint ventures: As of March 31, 2021 December 31, 2020 Equity method investments $ 1,068 $ 1,189 Three Months Ended March 31, March 31, 2021 March 31, 2020 Expense recognized $ 62 $ 53

Equity and Earnings Per Share (

Equity and Earnings Per Share (Tables)3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]
Schedule of Earnings Per Share, Basic and DilutedThe following is a reconciliation of the numerator and denominator for the computation of basic and diluted earnings per share: Three Months Ended March 31, (In thousands, except per share data) 2021 2020 Numerator: Net income attributable to common shareholders $ 11,174 $ 6,201 Adjustment for accretion of tax equity financing fees (31) — Income attributable to common shareholders $ 11,143 $ 6,201 Denominator: Basic weighted-average shares outstanding 48,975 47,384 Effect of dilutive securities: Stock options 1,382 1,113 Diluted weighted-average shares outstanding 50,357 48,497 Net income per share attributable to common shareholders: Basic $ 0.23 $ 0.13 Diluted $ 0.22 $ 0.13 Potentially dilutive shares (1) 1,157 431 (1) Potentially dilutive shares attributable to stock options were excluded from the computation of diluted earnings per share as the effect would have been anti-dilutive.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]
Schedule of Share-based Compensation ExpenseWe recorded stock-based compensation expense, including expense related to our employee stock purchase plan, as follows: Three Months Ended March 31, 2021 2020 Stock-based compensation expense $ 766 $ 429

Business Segment Information (T

Business Segment Information (Tables)3 Months Ended
Mar. 31, 2021
Segment Reporting [Abstract]
Schedule of Operational Results by Business SegmentsThe table below presents our business segment information recast for the prior-year period and a reconciliation to the condensed consolidated financial statements: U.S. Regions U.S. Federal Canada Non-Solar DG All Other Total Consolidated Three Months Ended March 31, 2021 Revenues $ 85,273 $ 102,214 $ 11,643 $ 30,368 $ 22,704 $ 252,202 Interest income (1) 34 2 — 1,074 — 1,110 Interest expense 2,009 324 386 610 143 3,472 Depreciation and amortization of intangible assets 3,575 1,010 415 4,862 287 10,149 Unallocated corporate activity — — — — — (11,160) Income (loss) before taxes, excluding unallocated corporate activity 3,510 12,030 (85) 8,628 1,713 25,796 Three Months Ended March 31, 2020 Revenues $ 85,840 $ 68,745 $ 11,392 $ 22,724 $ 23,712 $ 212,413 Interest income (1) 221 40 — 53 — 314 Interest expense 1,665 746 172 1,083 15 3,681 Depreciation and amortization of intangible assets 2,862 1,017 391 5,287 277 9,834 Unallocated corporate activity — — — — — (10,317) Income (loss) before taxes, excluding unallocated corporate activity 4,038 7,094 (221) 1,669 1,870 14,450 (1) Includes gains recognized on derivative instruments. See Note 11 for additional information.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Allowance for Credit Loss (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit losses, beginning of period $ 2,266 $ 2,260
Charges to costs and expenses, net3 49
Account write-offs and other41
Account write-offs and other(189)
Allowance for credit losses, end of period $ 2,310 $ 2,120

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues $ 252,202 $ 212,413
United States
Disaggregation of Revenue [Line Items]
Revenues234,009 195,939
Canada
Disaggregation of Revenue [Line Items]
Revenues10,853 10,553
Other
Disaggregation of Revenue [Line Items]
Revenues7,340 5,921
Project revenue
Disaggregation of Revenue [Line Items]
Revenues180,693 144,429
O&M revenue
Disaggregation of Revenue [Line Items]
Revenues18,484 18,062
Energy assets
Disaggregation of Revenue [Line Items]
Revenues33,287 28,222
Integrated-PV
Disaggregation of Revenue [Line Items]
Revenues9,154 11,469
Other
Disaggregation of Revenue [Line Items]
Revenues10,584 10,231
U.S. Regions
Disaggregation of Revenue [Line Items]
Revenues85,273 85,840
U.S. Regions | Project revenue
Disaggregation of Revenue [Line Items]
Revenues71,158 71,493
U.S. Regions | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues4,310 4,352
U.S. Regions | Energy assets
Disaggregation of Revenue [Line Items]
Revenues8,810 8,854
U.S. Regions | Integrated-PV
Disaggregation of Revenue [Line Items]
Revenues0 0
U.S. Regions | Other
Disaggregation of Revenue [Line Items]
Revenues995 1,141
U.S. Federal
Disaggregation of Revenue [Line Items]
Revenues102,214 68,745
U.S. Federal | Project revenue
Disaggregation of Revenue [Line Items]
Revenues90,089 56,114
U.S. Federal | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues11,440 11,626
U.S. Federal | Energy assets
Disaggregation of Revenue [Line Items]
Revenues664 719
U.S. Federal | Integrated-PV
Disaggregation of Revenue [Line Items]
Revenues0 0
U.S. Federal | Other
Disaggregation of Revenue [Line Items]
Revenues21 286
Canada
Disaggregation of Revenue [Line Items]
Revenues11,643 11,392
Canada | Project revenue
Disaggregation of Revenue [Line Items]
Revenues9,001 8,864
Canada | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues26 9
Canada | Energy assets
Disaggregation of Revenue [Line Items]
Revenues747 663
Canada | Integrated-PV
Disaggregation of Revenue [Line Items]
Revenues0 0
Canada | Other
Disaggregation of Revenue [Line Items]
Revenues1,869 1,856
Non-Solar DG
Disaggregation of Revenue [Line Items]
Revenues30,368 22,724
Non-Solar DG | Project revenue
Disaggregation of Revenue [Line Items]
Revenues4,654 2,371
Non-Solar DG | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues2,637 2,015
Non-Solar DG | Energy assets
Disaggregation of Revenue [Line Items]
Revenues22,931 17,986
Non-Solar DG | Integrated-PV
Disaggregation of Revenue [Line Items]
Revenues0 0
Non-Solar DG | Other
Disaggregation of Revenue [Line Items]
Revenues146 352
All Other
Disaggregation of Revenue [Line Items]
Revenues22,704 23,712
All Other | Project revenue
Disaggregation of Revenue [Line Items]
Revenues5,791 5,587
All Other | O&M revenue
Disaggregation of Revenue [Line Items]
Revenues71 60
All Other | Energy assets
Disaggregation of Revenue [Line Items]
Revenues135 0
All Other | Integrated-PV
Disaggregation of Revenue [Line Items]
Revenues9,154 11,469
All Other | Other
Disaggregation of Revenue [Line Items]
Revenues $ 7,553 $ 6,596

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Details) - USD ($)3 Months Ended
Mar. 31, 2021Mar. 31, 2020Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percentage of revenue recognized over time94.00%91.00%
Contract with customer, asset, revenue recognized $ 144,539,000 $ 151,885,000
Contract with customer, asset, reclassified to receivable130,297,000 137,220,000
Contract with customer, liability, revenue recognized45,483,000 19,928,000
Contract with customer, liability, billings33,081,000 16,377,000
Revenue, remaining performance obligation $ 1,914,710,000
Contract term25 years
Capitalized project development costs, noncurrent $ 1,559,000 $ 1,543,000
Capitalized contract cost, project development costs1,985,000 1,635,000
Capitalized contract cost, impairment loss $ 0 $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue, remaining performance obligation, percentage35.00%
Revenue, remaining performance obligation, remaining satisfaction12 months

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Contract Balances (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020Mar. 31, 2020Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Accounts receivable, net $ 113,095 [1] $ 125,010 [1] $ 110,742 $ 95,863
Accounts receivable retainage, net32,071 30,189 21,265 16,976
Contract Assets:
Costs and estimated earnings in excess of billings179,474 [1]185,960 [1]189,566 202,243
Contract Liabilities:
Billings in excess of cost and estimated earnings30,211 33,984 25,350 26,618
Billings in excess of cost and estimated earnings, non-current6,590 6,631 5,320 5,560
Total contract liabilities $ 36,801 $ 40,615 $ 30,670 $ 32,178
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets, Net - Goodwill (Details) $ in Thousands3 Months Ended
Mar. 31, 2021USD ($)
Carrying Value of Goodwill
Balance, December 31, 2020 $ 58,714
Currency effects98
Balance, March 31, 202158,812
U.S. Regions
Carrying Value of Goodwill
Balance, December 31, 202026,705
Currency effects0
Balance, March 31, 202126,705
U.S. Federal
Carrying Value of Goodwill
Balance, December 31, 20203,981
Currency effects0
Balance, March 31, 20213,981
Canada
Carrying Value of Goodwill
Balance, December 31, 20203,441
Currency effects41
Balance, March 31, 20213,482
Non-solar DG
Carrying Value of Goodwill
Balance, December 31, 20200
Currency effects0
Balance, March 31, 20210
Other
Carrying Value of Goodwill
Balance, December 31, 202024,587
Currency effects57
Balance, March 31, 2021 $ 24,644

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Gross carrying amount $ 27,240 $ 27,240
Accumulated amortization26,393 26,313
Intangible assets, net $ 847 $ 927

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets, Net - Amortization (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Amortization of debt discount and debt issuance costs $ 80 $ 179
Customer contracts
Finite-Lived Intangible Assets [Line Items]
Amortization of debt discount and debt issuance costs0 22
All other intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of debt discount and debt issuance costs $ 80 $ 157

Energy Assets, Net - Energy Ass

Energy Assets, Net - Energy Assets (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Energy assets, net[1] $ 765,122 $ 729,378
Energy Assets
Property, Plant and Equipment [Line Items]
Energy assets1,000,085 954,426
Less - accumulated depreciation and amortization(234,963)(225,048)
Energy assets, net $ 765,122 $ 729,378
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Energy Assets, Net - Additional

Energy Assets, Net - Additional Information (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020Dec. 31, 2020
Business Acquisition [Line Items]
Cost of revenues $ 9,686 $ 9,299
Capitalized interest2,238 862
ARO assets, net2,032 $ 1,468
ARO liabilities, current6 86
ARO liabilities, non-current2,251 1,561
Total ARO liabilities2,257 $ 1,647
Depreciation expense of ARO assets833 833
Accretion expense of ARO liabilities24 21
ARO Asset
Business Acquisition [Line Items]
Depreciation expense of ARO assets $ 23 $ 19

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Operating Leases:
Operating lease assets[1] $ 41,484 $ 39,151
Current portions of operating lease liabilities[1]5,680 6,106
Long-term portions of operating lease liabilities[1]37,718 35,300
Total operating lease liabilities $ 43,398 $ 41,406
Weighted-average remaining lease term12 years12 years
Weighted-average discount rate5.81%5.94%
Financing Leases:
Energy assets $ 33,473 $ 34,005
Current portions of financing lease liabilities4,273 4,273
Long-term financing lease liabilities, net of current portion, unamortized discount and debt issuance costs19,199 19,227
Total financing lease liabilities $ 23,472 $ 23,500
Weighted-average remaining lease term16 years16 years
Weighted-average discount rate11.93%11.94%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]Energy assets, netEnergy assets, net
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]Long-term debt and financing lease liabilities, net of current portion and deferred financing feesLong-term debt and financing lease liabilities, net of current portion and deferred financing fees
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Leases - Lease Cost (Details)

Leases - Lease Cost (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Operating Leases:
Operating lease costs $ 2,153 $ 1,826
Financing Leases:
Amortization expense532 532
Interest on lease liabilities658 801
Total lease costs $ 3,343 $ 3,159

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flows (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities $ 2,423 $ 1,927
Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,773 $ 906

Leases - Minimum Future Lease O

Leases - Minimum Future Lease Obligations (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Operating Leases
2021 $ 5,970
20227,853
20236,510
20245,439
20254,431
Thereafter32,565
Total minimum lease payments62,768
Less: interest19,370
Present value of lease liabilities43,398 $ 41,406
Financing Leases
20216,736
20225,178
20233,676
20242,565
20252,213
Thereafter21,866
Total minimum lease payments42,234
Less: interest18,762
Present value of lease liabilities $ 23,472 $ 23,500

Leases - Additional Information

Leases - Additional Information (Details)3 Months Ended
Mar. 31, 2021USD ($)Mar. 31, 2020USD ($)projectMar. 31, 2022USD ($)Mar. 22, 2021USD ($)
Lessee, Lease, Description [Line Items]
Commitment, amount $ 3,000,000
Maximum combined funding amount $ 150,000,000
Net amortization expense57,000 $ 55,000
Solar Photovoltaic Projects
Lessee, Lease, Description [Line Items]
Solar PV projects sold | project1
Proceeds from sale-leaseback financings $ 1,087,000
Solar Photovoltaic Projects | Revolving Credit Facility | Line of Credit
Lessee, Lease, Description [Line Items]
Available funding under lending commitment $ 310,618,000
Forecast
Lessee, Lease, Description [Line Items]
Maximum combined funding amount $ 350,000,000

Debt and Financing Lease Liab_3

Debt and Financing Lease Liabilities - Summary of Long-term Debt (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Debt Instrument [Line Items]
Financing lease liabilities $ 23,472 $ 23,500
Total debt and financing lease liabilities350,572 391,761
Less: current maturities71,770 69,362
Less: unamortized discount and debt issuance costs10,391 10,725
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs[1]268,411 311,674
Term Loan | Senior secured term loan
Debt Instrument [Line Items]
Long-term debt, gross56,469 57,688
Term Loan | Non-recourse term loans
Debt Instrument [Line Items]
Long-term debt, gross204,885 198,124
Term Loan | Long-term financing facilities
Debt Instrument [Line Items]
Long-term debt, gross29,989 32,618
Line of Credit | Non-recourse construction revolvers
Debt Instrument [Line Items]
Long-term debt, gross35,757 26,758
Revolving Senior Secured Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross $ 0 $ 53,073
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Debt and Financing Lease Liab_4

Debt and Financing Lease Liabilities - Additional Information (Details) - Revolving Credit Facility - Line of Credit3 Months Ended
Mar. 31, 2021USD ($)projectOct. 31, 2020USD ($)Oct. 01, 2020USD ($)Sep. 30, 2020USD ($)Jun. 30, 2020USD ($)
Debt Instrument [Line Items]
Funds available for borrowing $ 101,241,000
October 2020 Term Loan Modification
Debt Instrument [Line Items]
Maximum borrowing capacity $ 50,000,000 $ 35,000,000 $ 28,500,000
Line of credit option amount $ 15,000,000
Net proceeds14,848,000
Principal amount1,250,000
Unamortized discount150,000
Debt instrument, fee amount2,000
Line of credit48,547,000
June 2020 Construction Revolver
Debt Instrument [Line Items]
Maximum borrowing capacity $ 100,000,000
Line of credit29,460,000
Closed funding for additional projects $ 14,013,000
Number of additional project | project4
Borrowing capacity Increase limit $ 711,000
Funds available for borrowing $ 70,099,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020Dec. 31, 2020
Income Tax Disclosure [Abstract]
Income tax provision (benefit) $ 2,205 $ (2,503)
Effective tax rate, percentage15.10%(60.60%)
Unrecognized tax benefits $ 190 $ 190

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) $ in ThousandsMar. 31, 2021USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, December 31, 2020 $ 600
Balance, March 31, 2021 $ 600

Commitments and Contingencies (

Commitments and Contingencies (Details)Nov. 06, 2017contractorAug. 31, 2018USD ($)Mar. 31, 2021USD ($)Dec. 31, 2020USD ($)
Loss Contingencies [Line Items]
Number of defendants | contractor9
Undisclosed Name of Acquiree 2
Loss Contingencies [Line Items]
Contingent consideration, liability, revenue earn-outs, payment period (in years)5 years
Contingent consideration, liability, fair value at date of acquisition $ 678,000 $ 678,000
Initial cash payment $ 0

Fair Value Measurement - Fair V

Fair Value Measurement - Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - Recurring - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Liabilities:
Total liabilities $ 8,992 $ 11,163
Level 2
Assets:
Total assets1,405 365
Level 2 | Interest rate swap instruments
Assets:
Total assets1,290 2
Liabilities:
Liability derivatives7,202 10,073
Level 2 | Commodity swap instruments
Assets:
Total assets115 363
Level 2 | Make-whole provisions
Liabilities:
Liability derivatives1,112 412
Level 3
Liabilities:
Contingent consideration $ 678 $ 678

Fair Value Measurement - Fair_2

Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt (Level 2) $ 320,279 $ 363,460
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt (Level 2) $ 316,709 $ 357,536

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Derivatives Designated as Hedging Instruments: | Interest rate swap contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives $ 7,157 $ 9,994
Derivatives Not Designated as Hedging Instruments: | Interest rate swap contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives1,290 2
Derivatives Not Designated as Hedging Instruments: | Interest rate swap contracts | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives45 79
Derivatives Not Designated as Hedging Instruments: | Commodity swap contracts | Other assets
Derivatives, Fair Value [Line Items]
Asset derivatives115 363
Derivatives Not Designated as Hedging Instruments: | Make-whole provisions | Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives $ 1,112 $ 412

Derivative Instruments and He_4

Derivative Instruments and Hedging Activities - Additional Information (Details) $ in Thousands3 Months Ended
Mar. 31, 2021USD ($)contractDec. 31, 2020contract
Not Designated
Derivative [Line Items]
Number of instruments held | contract5 5
Accumulated Gain (Loss), Net, Cash Flow Hedge
Derivative [Line Items]
Loss reclassified from AOCI to other expenses, net | $ $ 523

Derivative Instruments and He_5

Derivative Instruments and Hedging Activities - Effects on Statements of Income (Loss) and Consolidated Statements of Comprehensive Loss (Details) - Other expenses, net - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Derivatives Designated as Hedging Instruments: | Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income $ 523 $ 99
Derivatives Not Designated as Hedging Instruments: | Interest rate swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income(1,322)10
Derivatives Not Designated as Hedging Instruments: | Commodity swap contracts
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income248 (48)
Derivatives Not Designated as Hedging Instruments: | Make-whole provisions
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Gain) Loss Recognized in Net Income $ 697 $ (185)

Derivative Instruments and He_6

Derivative Instruments and Hedging Activities - Effects of Derivative Instruments in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance $ 492,813 $ 428,856
Total other comprehensive income (loss)2,531 (5,777)
Ending balance628,855 $ 432,177
Accumulated Gain (Loss), Net, Cash Flow Hedge
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance(7,526)
Unrealized gain recognized in AOCI1,595
Loss reclassified from AOCI to other expenses, net523
Total other comprehensive income (loss)2,118
Ending balance $ (5,408)

Derivative Instruments and He_7

Derivative Instruments and Hedging Activities - Summary of Active Derivative Instruments (Details)3 Months Ended
Mar. 31, 2021USD ($)MMBTU$ / MMBTU
Designated | Interest Rate Swap October 2029
Derivative [Line Items]
Term of contract, years11 years
Fixed interest rate, percentage5.77%
Initial Notional Amount ($) $ 9,200,000
Designated | Interest Rate Swap June 2033
Derivative [Line Items]
Term of contract, years15 years
Fixed interest rate, percentage5.24%
Initial Notional Amount ($) $ 10,000,000
Designated | Interest Rate Swap - December 2027
Derivative [Line Items]
Term of contract, years10 years
Fixed interest rate, percentage4.74%
Initial Notional Amount ($) $ 14,100,000
Designated | Interest Rate Swap - December 2038
Derivative [Line Items]
Term of contract, years15 years
Fixed interest rate, percentage3.26%
Initial Notional Amount ($) $ 14,084,000
Designated | Interest Rate Swap - February 2023
Derivative [Line Items]
Term of contract, years7 years
Fixed interest rate, percentage2.19%
Initial Notional Amount ($) $ 20,746,000
Designated | Interest Rate Swap - June 2028
Derivative [Line Items]
Term of contract, years8 years
Fixed interest rate, percentage3.70%
Initial Notional Amount ($) $ 14,643,000
Designated | Interest Rate Swap - June 2028
Derivative [Line Items]
Term of contract, years8 years
Fixed interest rate, percentage3.70%
Initial Notional Amount ($) $ 10,734,000
Designated | Interest Rate Swap - March 2024
Derivative [Line Items]
Term of contract, years15 years 6 months
Fixed interest rate, percentage5.40%
Initial Notional Amount ($) $ 13,081,000
Not Designated | Interest Rate Swap March 2033
Derivative [Line Items]
Term of contract, years13 years
Fixed interest rate, percentage0.93%
Initial Notional Amount ($) $ 9,505,000
Not Designated | Interest Rate Swap March 2033
Derivative [Line Items]
Term of contract, years13 years
Fixed interest rate, percentage0.93%
Initial Notional Amount ($) $ 6,968,000
Not Designated | Interest Rate Swap - September 2023
Derivative [Line Items]
Term of contract, years2 years 9 months
Fixed interest rate, percentage0.41%
Initial Notional Amount ($) $ 26,250,000
Not Designated | Commodity Contract - April 2021
Derivative [Line Items]
Term of contract, years1 year
Active commodity swap, price (in usd per unit) | $ / MMBTU2.70
Nonmonetary notional amount (in MMBtus) | MMBTU435,810
Not Designated | Commodity Contract - June 2024
Derivative [Line Items]
Term of contract, years3 years 6 months
Active commodity swap, price (in usd per unit) | $ / MMBTU2.65
Nonmonetary notional amount (in MMBtus) | MMBTU3,296,160
Not Designated | Make-whole Provisions December 2038 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value $ 706,000
Not Designated | Make-whole Provisions April 2031 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value115,000
Not Designated | Make-whole Provisions February 2034 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value119,000
Not Designated | Make-whole Provision December 2027 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value117,000
Not Designated | Make-whole Provision May 2028 | Other liabilities
Derivative [Line Items]
Liability derivatives, fair value $ 55,000

Investment Funds and Equity M_3

Investment Funds and Equity Method Investments - Schedule of Variable Interest Entity Financial Information (Details) - USD ($) $ in ThousandsMar. 31, 2021Dec. 31, 2020
Variable Interest Entity [Line Items]
Variable interest entities, current assets[1] $ 485,779 $ 490,715
Total assets[1]1,848,749 1,750,251
Variable interest entities, current liabilities[1]351,582 383,097
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current assets10,142 10,935
Total assets159,136 162,198
Variable interest entities, current liabilities2,961 3,758
Total VIE liabilities32,614 33,335
Cash and cash equivalents | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current assets5,691 5,828
Restricted cash | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current assets2,438 3,185
Accounts receivable, net | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current assets592 834
Costs and estimated earnings in excess of billings | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current assets1,331 968
Prepaid expenses and other current assets | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current assets90 120
Property and equipment, net | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent assets1,266 1,266
Energy assets, net | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent assets140,881 143,133
Operating lease assets | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent assets6,394 6,439
Other assets | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent assets453 425
Current portions of long-term debt and financing lease liabilities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current liabilities2,215 2,230
Accounts payable | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current liabilities150 311
Accrued expenses and other current liabilities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current liabilities466 1,092
Current portions of operating lease liabilities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, current liabilities130 125
Long-term debt and financing lease liabilities, net of current portion, unamortized discount and debt issuance costs | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent liabilities22,391 22,822
Long-term operating lease liabilities, net of current portion | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent liabilities6,195 6,220
Other liabilities | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Variable interest entities, noncurrent liabilities $ 1,067 $ 535
[1]Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $159,136 and $162,198, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $32,614 and $33,335, respectively. See Note 12 .

Investment Funds and Equity M_4

Investment Funds and Equity Method Investments - Investment in Joint Ventures (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Equity method investments $ 1,068 $ 1,189
Expense recognized $ 62 $ 53

Equity and Earnings Per Share -

Equity and Earnings Per Share - Additional Information (Details) - USD ($)Mar. 15, 2021Mar. 15, 2021Mar. 09, 2021Mar. 31, 2021Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Proceeds from equity offering, net of offering costs $ 120,216,000 $ 0
Deducting offering costs $ 5,542,000
Net proceeds to repayments $ 80,000,000
Class A Common Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Sale of stock shares issued in transaction (in shares)2,500,000
Offering price (in dollar per share) $ 44
Proceeds from equity offering, net of offering costs $ 104,458,000
Class A Common Stock | Over-Allotment Option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Sale of stock shares issued in transaction (in shares)375,000
Proceeds from equity offering, net of offering costs $ 15,758,000
Deducting offering costs $ 742,000
Class A Common Stock | Selling Shareholders
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Sale of stock shares issued in transaction (in shares)805,000
Offering price (in dollar per share) $ 44 $ 44
Proceeds from equity offering, net of offering costs $ 0

Equity and Earnings Per Share_2

Equity and Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Numerator:
Net income attributable to common shareholders $ 11,174 $ 6,201
Adjustment for accretion of tax equity financing fees(31)0
Income attributable to common shareholders $ 11,143 $ 6,201
Denominator:
Basic weighted-average shares outstanding (in shares)48,975 47,384
Effect of dilutive securities:
Stock options (in shares)1,382 1,113
Diluted weighted-average shares outstanding (in shares)50,357 48,497
Net income per share attributable to common shareholders:
Basic (in usd per share) $ 0.23 $ 0.13
Diluted (in usd per share) $ 0.22 $ 0.13
Potentially dilutive shares (in shares)1,157 431

Stock-Based Compensation - Comp

Stock-Based Compensation - Compensation Expense (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock-based compensation expense $ 766 $ 429

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) $ in Thousands3 Months Ended
Mar. 31, 2021USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options unrecognized compensation expense | $ $ 26,077
2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period (in shares) | shares694,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock options unrecognized compensation expense, weighted-average period of recognition3 years
Stock Options | 2020 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, contractual period10 years
Stock options, vesting period5 years

Business Segment Information (D

Business Segment Information (Details) - USD ($) $ in Thousands3 Months Ended
Mar. 31, 2021Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues $ 252,202 $ 212,413
Interest income1,110 314
Interest expense3,472 3,681
Depreciation and amortization of intangible assets10,149 9,834
Income (loss) before taxes, excluding unallocated corporate activity25,796 14,450
U.S. Regions
Segment Reporting Information [Line Items]
Revenues85,273 85,840
U.S. Federal
Segment Reporting Information [Line Items]
Revenues102,214 68,745
Canada
Segment Reporting Information [Line Items]
Revenues11,643 11,392
Non-Solar DG
Segment Reporting Information [Line Items]
Revenues30,368 22,724
All Other
Segment Reporting Information [Line Items]
Revenues22,704 23,712
Operating Segments | U.S. Regions
Segment Reporting Information [Line Items]
Revenues85,273 85,840
Interest income34 221
Interest expense2,009 1,665
Depreciation and amortization of intangible assets3,575 2,862
Income (loss) before taxes, excluding unallocated corporate activity3,510 4,038
Operating Segments | U.S. Federal
Segment Reporting Information [Line Items]
Revenues102,214 68,745
Interest income2 40
Interest expense324 746
Depreciation and amortization of intangible assets1,010 1,017
Income (loss) before taxes, excluding unallocated corporate activity12,030 7,094
Operating Segments | Canada
Segment Reporting Information [Line Items]
Revenues11,643 11,392
Interest income0 0
Interest expense386 172
Depreciation and amortization of intangible assets415 391
Income (loss) before taxes, excluding unallocated corporate activity(85)(221)
Operating Segments | Non-Solar DG
Segment Reporting Information [Line Items]
Revenues30,368 22,724
Interest income1,074 53
Interest expense610 1,083
Depreciation and amortization of intangible assets4,862 5,287
Income (loss) before taxes, excluding unallocated corporate activity8,628 1,669
Operating Segments | All Other
Segment Reporting Information [Line Items]
Revenues22,704 23,712
Interest income0 0
Interest expense143 15
Depreciation and amortization of intangible assets287 277
Income (loss) before taxes, excluding unallocated corporate activity1,713 1,870
Unallocated corporate activity
Segment Reporting Information [Line Items]
Unallocated corporate activity $ (11,160) $ (10,317)

Uncategorized Items - amrc-2021

LabelElementValue
Restricted Cash and Cash Equivalents, Noncurrentus-gaap_RestrictedCashAndCashEquivalentsNoncurrent $ 10,507,000
Restricted Cash and Cash Equivalents, Noncurrentus-gaap_RestrictedCashAndCashEquivalentsNoncurrent $ 24,333,000