The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

On January 1, 2018, we adopted ASC 606, which is a comprehensive new revenue recognition model that requires revenue to be recognized in a manner to depict the transfer of goods or services and satisfaction of performance obligations to a customer at an amount that reflects the consideration expected to be received in exchange for those goods or services. We applied the modified retrospective method to contracts that were not completed as of January 1, 2018. Results for reporting periods beginning after January 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported under the previous accounting standards. We recorded a net increase to opening retained earnings of $22.4 million, net of tax, as of January 1, 2018, due to the cumulative impact of adopting ASC 606, with the impact primarily related to the recognition of a contract assetassets for insurance brokerage commission renewals. There was not a material impact to revenues as a result of applying ASC 606 for the threesix months ended March 31,June 30, 2018, and there have not been significant changes to our business processes, systems, or internal controls as a result of implementing the standard.

We adopted Accounting Standards Update ("ASU") ASU No. 2016-15, "Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments" ("ASU 2016-15"), as of January 1, 2018, on a retrospective basis. The ASU addresses several specific cash flow issues. The adoption of ASU 2016-15 had no effect on our financial statements.

In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"), which amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets. ASU 2016-02 is effective for us for annual and interim periods beginning January 1, 2019, and early adoption is permitted. The standard requires a modified retrospective transition approach for all leases existing at, or entered into after, the date of initial application. While the recognition of right-of-use assets and related liabilities will have a material effect on our consolidated balance sheets, we do not expect a material impact on our consolidated statementstatements of operations. The FASB also issued ASU No. 2018-01, "Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842", which provides guidance on specific transition issues. We continue to evaluate the full impact of the new standards, including the impact on our business processes, systems, and internal controls.

In June 2016, the FASB issued ASU No. 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), which changes the impairment model for most financial assets and certain other instruments from an "incurred loss" approach to a new "expected credit loss" methodology and also requires that credit losses from available-for-sale debt securities be presented as an allowance instead of a write-down. ASU 2016-13 is effective for us for annual and interim periods beginning January 1, 2020, with early adoption permitted, and requires full retrospective application on adoption. We are currently evaluating the impact the standard will have on our financial statements.

In January 2017, the FASB issued ASU No. 2017-04, "Intangibles - Goodwill and Other (Topic 350): Simplifying the Accounting for Goodwill Impairment" ("ASU 2017-04"), which removes the requirement to perform a hypothetical purchase

We enter into land option agreements in order to procure land for the construction of homes in the future. Pursuant to these land option agreements, we generally provide a deposit to the seller as consideration for the right to purchase land at different times in the future, usually at predetermined prices. Such contracts enable us to defer acquiring portions of properties owned by third parties or unconsolidated entities until we have determined whether and when to exercise our option, which reduces our financial risks associated with long-term land holdings. Option deposits and pre-acquisition costs (such as environmental testing, surveys, engineering, and entitlement costs) are capitalized if the costs are directly identifiable with the land under option, the costs would be capitalized if we owned the land, and acquisition of the property is probable. Such costs are reflected in other assets and are reclassified to inventory upon taking title to the land. We write off deposits and pre-acquisition costs when it becomes probable that we will not go forward with the project or recover the capitalized costs. Such decisions take into consideration changes in local market conditions, the timing of required land purchases, the availability and best use of necessary incremental capital, and other factors. We record any such write-offs of deposits and pre-acquisition costs within other expense, net.

If an entity holding the land under option is a variable interest entity ("VIE"), our deposit represents a variable interest in that entity. No VIEs required consolidation at either March 31,June 30, 2018 or December 31, 2017 because we determined that we were not the VIEs' primary beneficiary. Our maximum exposure to loss related to these VIEs is generally limited to our deposits and pre-acquisition costs under the land option agreements.

The following provides a summary of our interests in land option agreements as of March 31,June 30, 2018 and December 31, 2017 ($000’s omitted): 

Our Homebuilding operations are engaged in the acquisition and development of land primarily for residential purposes within the U.S. and the construction of housing on such land. For reporting purposes, our Homebuilding operations are aggregated into six reportable segments:

Other notes payable include non-recourse and limited recourse collateralized notes with third parties that totaled $100.8$18.8 million and $20.0 million at March 31,June 30, 2018 and December 31, 2017, respectively. These notes have maturities ranging up to three years, are secured by the applicable land positions to which they relate, and have no recourse to any other assets. The stated interest rates on these notes range up to 7.53%7.8%. In the three months ended March 31, 2018, we borrowed $81.2 million under one note to finance the acquisition of land. We fully repaid this note in April 2018.

At March 31,June 30, 2018, aggregate outstanding debt of unconsolidated joint ventures was $57.8$55.0 million, of which $57.0$54.2 million was related to one joint venture in which we have a 50% interest. In connection with this loan, we and our joint venture partner provided customary limited recourse guaranties under which our maximum financial loss exposure is limited to our pro rata share of the debt outstanding. The limited guaranties include, but are not limited to: (i) completion of certain aspects of the project; (ii) an environmental indemnity provided to the lender; and (iii) an indemnification of the lender from certain "bad boy acts" of the joint venture.