SUMMARY OF SIGNIFCANT ACCOUNTING POLICIES	12 Months Ended
Dec. 31, 2021
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP). Principles of Consolidation The consolidated financial results of Altus Midstream are included in the Company’s consolidated financial statements due to the Company’s 100 percent ownership interest in Altus Midstream GP, and Altus Midstream GP’s control of Altus Midstream. The Company has no independent operations or material assets other than its partnership interests in Altus Midstream, which constitutes all of its business. The Company’s only material net assets separate from Altus Midstream relate to deferred taxes and the current and deferred income tax expense (benefit) associated with its investment in Altus Midstream in 2018. In the fourth quarter of 2019, the Company recorded a full valuation allowance against its net deferred tax assets. Accordingly, the deferred tax asset balance was nil as of the years ended December 31, 2021 and 2020. Additionally, the Company’s balance sheet reflects the presentation of noncontrolling interest ownership attributable to the limited partner interests in Altus Midstream held by Apache and the holders of Series A Cumulative Redeemable Preferred Units (the Preferred Units). Refer to Note 12—Income Taxes, Note 10—Equity and Warrants, and Note 11—Series A Cumulative Redeemable Preferred Units for further information. Variable Interest Entity Altus Midstream is a variable interest entity (VIE) because the partners in Altus Midstream with equity at risk lack the power, through voting or similar rights, to direct the activities that most significantly impact Altus Midstream’s economic performance. A reporting entity that concludes it has a variable interest in a VIE must evaluate whether it has a controlling financial interest in the VIE, such that it is the VIE’s primary beneficiary and should consolidate. The Company is the primary beneficiary of Altus Midstream, and therefore should consolidate Altus Midstream because (i) the Company has the ability to direct the activities of Altus Midstream that most significantly affect its economic performance, and (ii) the Company has the right to receive benefits or the obligation to absorb losses that could be potentially significant to Altus Midstream. Redeemable Noncontrolling Interest — Apache Limited Partner As of December 31, 2021, the Company’s redeemable noncontrolling interest presented in the consolidated financial statements consisted of Common Units representing limited partner interests in Altus Midstream held by Apache. Pursuant to certain provisions of the partnership agreement of Altus Midstream (as amended in connection with the Altus Combination, and subsequent issuance of Preferred Units, the Amended LPA), the limited partner interests held by Apache were equal to the number of shares of the Company’s Class C Common Stock held by Apache. The Company initially recorded the redeemable noncontrolling interest upon the issuance of the Common Units to Apache as part of the Altus Combination and based on the recapitalization value ascribed at the Closing Date to the limited partner interest. All or a portion of these Common Units could be redeemed at Apache’s option, which it elected in January 2022 in respect of all such Common Units. The Company had the ability to settle the redemption option either (i) in shares of Class A Common Stock on a one-for-one basis, which it did in January 2022, or (ii) in cash (based on the fair market value of the Class A Common Stock as determined pursuant to the Altus Contribution Agreement), subject to customary conversion rate adjustments for stock splits, stock dividends, and reclassifications. Upon the January 2022 exchange of Common Units held by Apache for Class A Common Stock, a corresponding number of shares of Class C Common Stock were cancelled. The Company’s policy is to record the redeemable noncontrolling interest represented by the Common Units held by Apache at the higher of (i) its initial fair value plus accumulated earnings/losses associated with the noncontrolling interest or (ii) the redemption value as of the balance sheet date. See discussion and additional detail further discussed in Note 10—Equity and Warrants. Redeemable Noncontrolling Interest — Preferred Unit Limited Partners On June 12, 2019, Altus Midstream issued and sold the Preferred Units in a private offering, and the purchasers of the Preferred Units were admitted as limited partners of Altus Midstream. The Preferred Units will be exchangeable for shares of the Company’s Class A Common Stock at the option of the Preferred Unit holders after the seventh anniversary of the closing of the Preferred Unit offering or upon the occurrence of specified events, unless otherwise redeemed by Altus Midstream. The Preferred Units are accounted for on the Company’s consolidated balance sheet as a redeemable noncontrolling interest classified as temporary equity based on the terms of the Preferred Units. Certain redemption features embedded within the terms of the Preferred Units require bifurcation and measurement at fair value and are accounted for on the Company’s consolidated balance sheet as a long-term liability embedded derivative. See discussion and additional detail further discussed in Note 11—Series A Cumulative Redeemable Preferred Units and Note 14—Fair Value Measurements. Equity Method Interests The Company follows the equity method of accounting when it does not exercise control over its equity interests, but can exercise significant influence over the operating and financial policies of the entity. Under this method, the equity interests are carried originally at acquisition cost, increased by Altus’ proportionate share of the equity interest’s net income and contributions made by Altus, and decreased by Altus’ proportionate share of the equity interest’s net losses and distributions received by Altus. Equity method interests are assessed for impairment whenever changes in the facts and circumstances indicate a loss in value has occurred, if the loss is deemed to be other than temporary. When the loss is deemed to be other than temporary, the carrying value of the equity method investment is written down to fair value, and the amount of the write-down is included in income. As part of its review of the fair value of its assets in relation to the announced BCP Business Combination, Altus determined the current fair value of its investment in EPIC was below carrying value. The Company subsequently determined that this loss in value was deemed to be other than temporary. As such, in the fourth quarter of 2021, Altus recorded an impairment charge of $160.4 million on its equity method interest in EPIC. The fair value of the impaired interest was determined using the income approach, which considered Altus’ estimates of future throughput volumes, tariff rates, and costs. These assumptions were applied to develop future operating cash flow projections that were then discounted to estimated fair value using a discount rate believed to be consistent with that which would be applied by market participants. The amount arrived at was then considered against EPIC’s debt and the carrying value of the Company’s interest in EPIC to determine the recoverability of Altus’ interest as of December 31, 2021, resulting in the fourth quarter impairment charge. Altus has classified this nonrecurring fair value measurements as Level 3 in the fair value hierarchy. Refer to Note 9—Equity Method Interests for further details of the Company’s equity method interests. Use of Estimates Preparation of financial statements in conformity with GAAP and disclosure of contingent assets and liabilities requires management to make estimates and assumptions that affect reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. The Company evaluates its estimates and assumptions on a regular basis. Actual results may differ from these estimates and assumptions used in preparation of its financial statements, and changes in these estimates are recorded when known. Fair Value Measurements Accounting Standards Codification (ASC) 820-10-35, “Fair Value Measurement” (ASC 820), provides a hierarchy that prioritizes and defines the types of inputs used to measure fair value. The fair value hierarchy gives the highest priority to Level 1 inputs, which consist of unadjusted quoted prices for identical instruments in active markets. Level 2 inputs consist of quoted prices for similar instruments. Level 3 valuations are derived from inputs that are significant and unobservable; hence, these valuations have the lowest priority. The valuation techniques that may be used to measure fair value include a market approach, an income approach and a cost approach. A market approach uses prices and other relevant information generated by market transactions involving identical or comparable assets or liabilities. An income approach uses valuation techniques to convert future amounts to a single present amount based on current market expectations, including present value techniques, option-pricing models, and the excess earnings method. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost). Embedded features identified within the Company’s agreements are bifurcated and measured at fair value at the end of each period on the Company’s consolidated balance sheet. Such recurring fair value measurements are presented in further detail in Note 14—Fair Value Measurements. The Company also uses fair value measurements on a nonrecurring basis when certain qualitative assessments of its assets indicate a potential impairment. During the years ended December 31, 2021, 2020, and 2019, the Company recorded an impairment charge of $0.4 million, $1.6 million, and $1.3 billion, respectively, on certain assets. Refer to Property, Plant and Equipment—Impairment within this Note below and Note 4—Property, Plant and Equipment, for further detail. During the year ended December 31, 2021, the Company separately recorded an impairment of $160.4 million on its interest in EPIC. Refer to Equity Method Interests within this Note above and Note 9 —Equity M ethod Interests for further detail. Cash and Cash Equivalents The Company considers all highly liquid short-term investments with a maturity of three months or less at the time of purchase to be cash equivalents. These investments are carried at cost, which approximates fair value. As of December 31, 2021 and 2020, Altus Midstream had $132.0 million and $24.2 million, respectively, of cash and cash equivalents. Revenue Receivable For each period presented and upon commencement of operations, revenues were primarily generated from midstream services provided to Apache, which included gathering, processing, and transmission of natural gas. Revenue receivables represents revenues accrued that have been earned by Altus Midstream but not yet invoiced to Apache. There were no doubtful accounts written off, nor have we provided an allowance for doubtful accounts, as of December 31, 2021 and 2020. Inventories Inventories consist principally of equipment and material, stated at the lower of cost or net realizable value. Property, Plant, and Equipment Property, plant, and equipment consists of the costs incurred to acquire and construct midstream assets including capitalized interest. Depreciation Depreciation is computed over each asset’s estimated useful life using the straight-line method based on estimated useful lives and estimated asset salvage values. The estimated lives are generally 30 years for plants and facilities and 40 years for pipelines and such estimated useful lives were used to depreciate the Company’s assets in 2019. The estimation of useful life also takes into consideration anticipated production lives from the fields serviced by these assets, whether operated by Apache or a third-party. Determination of depreciation expense requires judgment regarding the estimated useful lives and salvage values of property, plant, and equipment. As circumstances warrant, depreciation estimates are reviewed to determine if any changes in the underlying assumptions are necessary. Given the fourth quarter 2019 impairment discussed under Impairment below, and as discussed further in Note 4—Property, Plant and Equipment, the Company reassessed the useful life of its assets in January of 2020. This assessment resulted in a change to estimated useful lives on its impaired assets to 12 years. For the years ended December 31, 2021, 2020, and 2019 depreciation expense totaled $11.9 million, $12.0 million, and $39.8 million, respectively. Asset Retirement Obligations and Accretion The initial estimated asset retirement obligation related to property, plant, and equipment and subsequent revisions are recorded as a liability at fair value, with an offsetting asset retirement cost recorded as an increase to the associated property, plant, and equipment on the consolidated balance sheet. Revisions in estimated liabilities can result from changes in estimated inflation rates, changes in service and equipment costs, and changes in the estimated timing of an asset’s retirement. Asset retirement costs are depreciated using a systematic and rational method similar to that used for the associated property, plant, and equipment. Accretion expense on the liability is recognized over the estimated productive life of the related assets and is included on the consolidated statements of operations under “Depreciation and accretion.” For the years ended December 31, 2021, 2020, and 2019 accretion expense totaled $4.3 million, $4.0 million, and $1.6 million, respectively. Capitalized Interest Interest is capitalized as part of the historical cost of developing and constructing assets. Significant midstream development assets, including assets owned by Altus through its equity method interests, that have not commenced operations qualify for interest capitalization. Capitalized interest is determined by multiplying Altus Midstream’s weighted-average borrowing cost of debt by the average amount of qualifying midstream assets. The amount of capitalized interest cannot be greater than actual interest incurred. Once an asset is placed into service, the associated capitalization of interest ceases and is expensed through depreciation over the asset’s useful life. Impairment The Company assesses the carrying amount of its property, plant, and equipment whenever events or changes in circumstances indicate a possible significant deterioration in future cash flows expected to be generated by an asset group. Individual assets are grouped for impairment purposes based on the lowest level for which there are identifiable cash flows that are largely independent of the cash flows of other asset groups. If, upon review, the carrying amount of an asset group is greater than the sum of the undiscounted expected cash flows, an impairment loss is recognized for the excess of the carrying value over its fair value. During the fourth quarter of 2020, the Company sold certain of its power generators and, as a result, the remaining power generators owned by the Company were remeasured at fair value based on the proceeds from such sale. This remeasurement resulted in an impairment of $1.6 million on these assets, and this nonrecurring fair value measurement is classified as Level 1 in the fair value hierarchy based on the negotiated sales price. Apache, as part of its fourth quarter 2019 review of its capital expenditure program, notified Altus that it had materially reduced its investment plans and had no plans to drill new wells at Alpine High. This notification prompted Altus management to assess its long-lived infrastructure assets for impairment, and as a result of this assessment, Altus recorded impairments of $1.3 billion on its gathering, processing, and transmission assets in the fourth quarter of 2019. Altus also recorded an impairment charge of $9.3 million in the third quarter of 2019 related to the cancellation of construction on a previously planned compressor station. The fair values of the impaired assets were determined using a combination of the income approach and the market approach (when direct sales bids on equivalent equipment was provided from third parties). The income approach considered several internal estimates of future throughput volumes, processing rates, and costs. The assumptions were applied to develop future cash flow projections that were then discounted to estimated fair value, using a discount rate believed to be consistent with those applied by market participants. Altus has classified these nonrecurring fair value measurements as Level 3 in the fair value hierarchy. These asset impairments are recorded within “Impairments” on the Company’s consolidated statement of operations. Refer to Note 4—Property, Plant and Equipment, for further detail. Accounts Receivable From/Payable To Apache The accounts receivable from or payable to Apache represent the net result of Altus Midstream’s monthly revenue, capital and operating expenditures, and other miscellaneous transactions to be settled with Apache as provided under the Construction, Operations and Maintenance Agreement (COMA) between the two entities. Generally, cash in this amount will be transferred to Apache in the month after the Company’s transactions are processed and the net results of operations are determined. However, from time to time, the Company may estimate and transfer the cash settlement amount in the month the transactions are processed, in order to minimize related-party working capital balances. See discussion and additional detail in Note 2—Transactions with Affiliates. Other Income In 2020, the Company entered into a contract with a provider to supply the Company with electrical power. If the Company does not utilize all of its fixed purchase volumes under this contract, then it will receive a credit based on a market rate for the related underutilization. In conjunction with increased power pricing due to the Texas freeze event and underutilization of contractual electricity volumes, the Company recognized an estimated total credit of approximately $9.7 million for the six months ended June 30, 2021. The Company did not recognize any additional credit during the remainder of 2021. These amounts are recorded on the statement of consolidated operations in “Other income.” The related power credit will offset the Company’s future monthly power payments and is recorded in “Prepaid assets and other” for the current portion and “Deferred charges and other” for the long-term portion on the consolidated balance sheet. No credits were recorded for the years ended December 31, 2020 and 2019. The Company has no remaining performance obligations related to these credits as of December 31, 2021. Distributions to Apache During 2021, the Company paid an aggregate $22.5 million in dividends on the Company’s Class A Common Stock, of which $5.6 million, or $1.50 per share, was paid in each quarter of 2021. Each quarterly Class A Common Stock dividend was funded by a distribution from Altus Midstream to its common unitholders of $1.50 per Common Unit, with each quarterly distribution totaling $24.4 million, of which $5.6 million was paid to the Company and the balance was paid to Apache due to its 76.9 percent ownership of outstanding Common Units. Please refer to Note 10—Equity and Warrants for further information. General and Administrative Expense General and administrative (G&A) expense represents indirect costs and overhead expenditures incurred by the Company associated with managing the midstream assets. In connection with the closing of the Altus Combination, the Company entered into the COMA, as described above, pursuant to which Apache will provide certain services related to the design, development, construction, operation, management, and maintenance of Altus Midstream’s assets, on the Company’s behalf. See discussion and additional detail further discussed in Note 2—Transactions with Affiliates. Maintenance and Repairs Routine maintenance and repairs are charged to expense as incurred. The Company had no non-routine maintenance or repair costs in any period presented. Income Taxes The Company is subject to federal income tax and recognizes deferred tax assets and liabilities based on the difference between the financial statement carrying value and tax basis of its investment in Altus Midstream. For federal income tax purposes, Altus Midstream is regarded as a partnership and not subject to income tax. Income and deductions associated with Altus Midstream and the Altus Midstream Entities flow through to the Company. As such, Altus Midstream and the Altus Midstream Entities do not record a federal income tax provision. The Company, Altus Midstream, and the Altus Midstream Entities are also subject to the Texas margin tax. The Texas margin tax is assessed on corporations, limited liability companies, and limited partnerships. As such, each entity recognizes state deferred tax assets and liabilities based on the differences between the financial statement carrying value and tax basis of assets and liabilities on the balance sheet. The Company routinely assesses the ability to realize its deferred tax assets. If the Company concludes that it is more likely than not that some or all of the deferred tax assets will not be realized, the tax asset is reduced by a valuation allowance. In connection with this assessment, the Company maintained a full valuation allowance against its net deferred tax asset as of December 31, 2021 and 2020. Change in Accounting Policy Historically, the Company reported income and loss from equity method interests on a one-month reporting lag. Effective October 1, 2019, the Company eliminated this one-month reporting lag. In accordance with ASC 810-10-45-13, “A Change in the Fiscal Year-End Lag Between Subsidiary and Parent” (ASC 810), the elimination of this previously existing reporting lag is considered a voluntary change in accounting principle in accordance with ASC 250-10-50, “Change in Accounting Principle.” The Company believes that this change in accounting principle is preferable as it provides the Company with the ability to present the results of its equity method interests for the same period as all other consolidated results of the Company, which improves overall financial reporting to investors by providing the most current information available. The Company has not retrospectively applied the change in accounting principle since its impact to the consolidated balance sheet and related statements of operations and cash flows was immaterial for all periods. For more information on equity method interests owned by the Company, please refer to Note 9—Equity Method Interests. New Pronouncements Issued But Not Yet Adopted In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848),” which provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (LIBOR) or by another reference rate expected to be discontinued. In January 2021, the FASB issued ASU 2021-01, which clarified the scope and application of the original guidance. The guidance was effective beginning March 12, 2020 and can be applied prospectively through December 31, 2022. The Company is evaluating whether to apply any of these expedients and, if elected, will adopt these standards when LIBOR is discontinued. In August 2020, the FASB issued ASU 2020-06, “Debt-Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging-Contracts in Entity’s Own Equity (Subtopic 815-40)” to improve financial reporting associated with accounting for convertible instruments and contracts in an entity’s own equity. This update is effective for the Company beginning in the first quarter of 2022, with early adoption permitted, using either the modified or fully retrospective method with a cumulative effect adjustment to the opening balance of retained earnings. The Company will adopt this ASU in the first quarter of 2022 and does not believe it will have a material impact on its financial statements.

The Company has no independent operations or material assets other than its partnership interests in Altus Midstream, which constitutes all of its business. The Company’s only material net assets separate from Altus Midstream relate to deferred taxes and the current and deferred income tax expense (benefit) associated with its investment in Altus Midstream in 2018. In the fourth quarter of 2019, the Company recorded a full valuation allowance against its net deferred tax assets. Accordingly, the deferred tax asset balance was nil as of the years ended December 31, 2021 and 2020. Additionally, the Company’s balance sheet reflects the presentation of noncontrolling interest ownership attributable to the limited partner interests in Altus Midstream held by Apache and the holders of Series A Cumulative Redeemable Preferred Units (the Preferred Units). Refer to Note 12—Income Taxes, Note 10—Equity and Warrants, and Note 11—Series A Cumulative Redeemable Preferred Units for further information.

A reporting entity that concludes it has a variable interest in a VIE must evaluate whether it has a controlling financial interest in the VIE, such that it is the VIE’s primary beneficiary and should consolidate. The Company is the primary beneficiary of Altus Midstream, and therefore should consolidate Altus Midstream because (i) the Company has the ability to direct the activities of Altus Midstream that most significantly affect its economic performance, and (ii) the Company has the right to receive benefits or the obligation to absorb losses that could be potentially significant to Altus Midstream.

As of December 31, 2021, the Company’s redeemable noncontrolling interest presented in the consolidated financial statements consisted of Common Units representing limited partner interests in Altus Midstream held by Apache. Pursuant to certain provisions of the partnership agreement of Altus Midstream (as amended in connection with the Altus Combination, and subsequent issuance of Preferred Units, the Amended LPA), the limited partner interests held by Apache were equal to the number of shares of the Company’s Class C Common Stock held by Apache.

The Company initially recorded the redeemable noncontrolling interest upon the issuance of the Common Units to Apache as part of the Altus Combination and based on the recapitalization value ascribed at the Closing Date to the limited partner interest. All or a portion of these Common Units could be redeemed at Apache’s option, which it elected in January 2022 in respect of all such Common Units. The Company had the ability to settle the redemption option either (i) in shares of Class A Common Stock on a one-for-one basis, which it did in January 2022, or (ii) in cash (based on the fair market value of the Class A Common Stock as determined pursuant to the Altus Contribution Agreement), subject to customary conversion rate adjustments for stock splits, stock dividends, and reclassifications. Upon the January 2022 exchange of Common Units held by Apache for Class A Common Stock, a corresponding number of shares of Class C Common Stock were cancelled.

On June 12, 2019, Altus Midstream issued and sold the Preferred Units in a private offering, and the purchasers of the Preferred Units were admitted as limited partners of Altus Midstream. The Preferred Units will be exchangeable for shares of the Company’s Class A Common Stock at the option of the Preferred Unit holders after the seventh anniversary of the closing of the Preferred Unit offering or upon the occurrence of specified events, unless otherwise redeemed by Altus Midstream.

The Preferred Units are accounted for on the Company’s consolidated balance sheet as a redeemable noncontrolling interest classified as temporary equity based on the terms of the Preferred Units. Certain redemption features embedded within the terms of the Preferred Units require bifurcation and measurement at fair value and are accounted for on the Company’s consolidated balance sheet as a long-term liability embedded derivative.

The Company follows the equity method of accounting when it does not exercise control over its equity interests, but can exercise significant influence over the operating and financial policies of the entity. Under this method, the equity interests are carried originally at acquisition cost, increased by Altus’ proportionate share of the equity interest’s net income and contributions made by Altus, and decreased by Altus’ proportionate share of the equity interest’s net losses and distributions received by Altus.

Equity method interests are assessed for impairment whenever changes in the facts and circumstances indicate a loss in value has occurred, if the loss is deemed to be other than temporary. When the loss is deemed to be other than temporary, the carrying value of the equity method investment is written down to fair value, and the amount of the write-down is included in income. As part of its review of the fair value of its assets in relation to the announced BCP Business Combination, Altus determined the current fair value of its investment in EPIC was below carrying value. The Company subsequently determined that this loss in value was deemed to be other than temporary. As such, in the fourth quarter of 2021, Altus recorded an impairment charge of $160.4 million on its equity method interest in EPIC. The fair value of the impaired interest was determined using the income approach, which considered Altus’ estimates of future throughput volumes, tariff rates, and costs. These assumptions were applied to develop future operating cash flow projections that were then discounted to estimated fair value using a discount rate believed to be consistent with that which would be applied by market participants. The amount arrived at was then considered against EPIC’s debt and the carrying value of the Company’s interest in EPIC to determine the recoverability of Altus’ interest as of December 31, 2021, resulting in the fourth quarter impairment charge. Altus has classified this nonrecurring fair value measurements as Level 3 in the fair value hierarchy.

Preparation of financial statements in conformity with GAAP and disclosure of contingent assets and liabilities requires management to make estimates and assumptions that affect reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. The Company bases its estimates on historical experience and various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about carrying values of assets and liabilities that are not readily apparent from other sources. The Company evaluates its estimates and assumptions on a regular basis. Actual results may differ from these estimates and assumptions used in preparation of its financial statements, and changes in these estimates are recorded when known.

Accounting Standards Codification (ASC) 820-10-35, “Fair Value Measurement” (ASC 820), provides a hierarchy that prioritizes and defines the types of inputs used to measure fair value. The fair value hierarchy gives the highest priority to Level 1 inputs, which consist of unadjusted quoted prices for identical instruments in active markets. Level 2 inputs consist of quoted prices for similar instruments. Level 3 valuations are derived from inputs that are significant and unobservable; hence, these valuations have the lowest priority.

An income approach uses valuation techniques to convert future amounts to a single present amount based on current market expectations, including present value techniques, option-pricing models, and the excess earnings method. The cost approach is based on the amount that currently would be required to replace the service capacity of an asset (replacement cost).

Embedded features identified within the Company’s agreements are bifurcated and measured at fair value at the end of each period on the Company’s consolidated balance sheet. Such recurring fair value measurements are presented in further detail in Note 14—Fair Value Measurements. The Company also uses fair value measurements on a nonrecurring basis when certain qualitative assessments of its assets indicate a potential impairment. During the years ended December 31, 2021, 2020, and 2019, the Company recorded an impairment charge of $0.4 million, $1.6 million, and $1.3 billion, respectively, on certain assets. Refer to Property, Plant and Equipment—Impairment within this Note below and Note 4—Property, Plant and Equipment, for further detail. During the year ended December 31, 2021, the Company separately recorded an impairment of $160.4 million on its interest in EPIC. Refer to Equity Method Interests within this Note above and Note 9 —Equity M ethod Interests for further detail.

The Company considers all highly liquid short-term investments with a maturity of three months or less at the time of purchase to be cash equivalents. These investments are carried at cost, which approximates fair value. As of December 31, 2021 and 2020, Altus Midstream had $132.0 million and $24.2 million, respectively, of cash and cash equivalents.

For each period presented and upon commencement of operations, revenues were primarily generated from midstream services provided to Apache, which included gathering, processing, and transmission of natural gas. Revenue receivables represents revenues accrued that have been earned by Altus Midstream but not yet invoiced to Apache. There were no doubtful accounts written off, nor have we provided an allowance for doubtful accounts, as of December 31, 2021 and 2020.

Depreciation is computed over each asset’s estimated useful life using the straight-line method based on estimated useful lives and estimated asset salvage values. The estimated lives are generally 30 years for plants and facilities and 40 years for pipelines and such estimated useful lives were used to depreciate the Company’s assets in 2019. The estimation of useful life also takes into consideration anticipated production lives from the fields serviced by these assets, whether operated by Apache or a third-party. Determination of depreciation expense requires judgment regarding the estimated useful lives and salvage values of property, plant, and equipment. As circumstances warrant, depreciation estimates are reviewed to determine if any changes in the underlying assumptions are necessary. Given the fourth quarter 2019 impairment discussed under Impairment below, and as discussed further in Note 4—Property, Plant and Equipment, the Company reassessed the useful life of its assets in January of 2020. This assessment resulted in a change to estimated useful lives on its impaired assets to 12 years. For the years ended December 31, 2021, 2020, and 2019 depreciation expense totaled $11.9 million, $12.0 million, and $39.8 million, respectively.

The initial estimated asset retirement obligation related to property, plant, and equipment and subsequent revisions are recorded as a liability at fair value, with an offsetting asset retirement cost recorded as an increase to the associated property, plant, and equipment on the consolidated balance sheet. Revisions in estimated liabilities can result from changes in estimated inflation rates, changes in service and equipment costs, and changes in the estimated timing of an asset’s retirement. Asset retirement costs are depreciated using a systematic and rational method similar to that used for the associated property, plant, and equipment. Accretion expense on the liability is recognized over the estimated productive life of the related assets and is included on the consolidated statements of operations under “Depreciation and accretion.” For the years ended December 31, 2021, 2020, and 2019 accretion expense totaled $4.3 million, $4.0 million, and $1.6 million, respectively.

Interest is capitalized as part of the historical cost of developing and constructing assets. Significant midstream development assets, including assets owned by Altus through its equity method interests, that have not commenced operations qualify for interest capitalization. Capitalized interest is determined by multiplying Altus Midstream’s weighted-average borrowing cost of debt by the average amount of qualifying midstream assets. The amount of capitalized interest cannot be greater than actual interest incurred. Once an asset is placed into service, the associated capitalization of interest ceases and is expensed through depreciation over the asset’s useful life.

The Company assesses the carrying amount of its property, plant, and equipment whenever events or changes in circumstances indicate a possible significant deterioration in future cash flows expected to be generated by an asset group. Individual assets are grouped for impairment purposes based on the lowest level for which there are identifiable cash flows that are largely independent of the cash flows of other asset groups. If, upon review, the carrying amount of an asset group is greater than the sum of the undiscounted expected cash flows, an impairment loss is recognized for the excess of the carrying value over its fair value.

During the fourth quarter of 2020, the Company sold certain of its power generators and, as a result, the remaining power generators owned by the Company were remeasured at fair value based on the proceeds from such sale. This remeasurement resulted in an impairment of $1.6 million on these assets, and this nonrecurring fair value measurement is classified as Level 1 in the fair value hierarchy based on the negotiated sales price.

Apache, as part of its fourth quarter 2019 review of its capital expenditure program, notified Altus that it had materially reduced its investment plans and had no plans to drill new wells at Alpine High. This notification prompted Altus management to assess its long-lived infrastructure assets for impairment, and as a result of this assessment, Altus recorded impairments of $1.3 billion on its gathering, processing, and transmission assets in the fourth quarter of 2019. Altus also recorded an impairment charge of $9.3 million in the third quarter of 2019 related to the cancellation of construction on a previously planned compressor station. The fair values of the impaired assets were determined using a combination of the income approach and the market approach (when direct sales bids on equivalent equipment was provided from third parties). The income approach considered several internal estimates of future throughput volumes, processing rates, and costs. The assumptions were applied to develop future cash flow projections that were then discounted to estimated fair value, using a discount rate believed to be consistent with those applied by market participants. Altus has classified these nonrecurring fair value measurements as Level 3 in the fair value hierarchy.

The accounts receivable from or payable to Apache represent the net result of Altus Midstream’s monthly revenue, capital and operating expenditures, and other miscellaneous transactions to be settled with Apache as provided under the Construction, Operations and Maintenance Agreement (COMA) between the two entities. Generally, cash in this amount will be transferred to Apache in the month after the Company’s transactions are processed and the net results of operations are determined. However, from time to time, the Company may estimate and transfer the cash settlement amount in the month the transactions are processed, in order to minimize related-party working capital balances. See discussion and additional detail in Note 2—Transactions with Affiliates.

In 2020, the Company entered into a contract with a provider to supply the Company with electrical power. If the Company does not utilize all of its fixed purchase volumes under this contract, then it will receive a credit based on a market rate for the related underutilization. In conjunction with increased power pricing due to the Texas freeze event and underutilization of contractual electricity volumes, the Company recognized an estimated total credit of approximately $9.7 million for the six months ended June 30, 2021. The Company did not recognize any additional credit during the remainder of 2021. These amounts are recorded on the statement of consolidated operations in “Other income.” The related power credit will offset the Company’s future monthly power payments and is recorded in “Prepaid assets and other” for the current portion and “Deferred charges and other” for the long-term portion on the consolidated balance sheet. No credits were recorded for the years ended December 31, 2020 and 2019. The Company has no remaining performance obligations related to these credits as of December 31, 2021.

During 2021, the Company paid an aggregate $22.5 million in dividends on the Company’s Class A Common Stock, of which $5.6 million, or $1.50 per share, was paid in each quarter of 2021. Each quarterly Class A Common Stock dividend was funded by a distribution from Altus Midstream to its common unitholders of $1.50 per Common Unit, with each quarterly distribution totaling $24.4 million, of which $5.6 million was paid to the Company and the balance was paid to Apache due to its 76.9 percent ownership of outstanding Common Units. Please refer to Note 10—Equity and Warrants for further information.

In connection with the closing of the Altus Combination, the Company entered into the COMA, as described above, pursuant to which Apache will provide certain services related to the design, development, construction, operation, management, and maintenance of Altus Midstream’s assets, on the Company’s behalf. See discussion and additional detail further discussed in Note 2—Transactions with Affiliates.

The Company is subject to federal income tax and recognizes deferred tax assets and liabilities based on the difference between the financial statement carrying value and tax basis of its investment in Altus Midstream. For federal income tax purposes, Altus Midstream is regarded as a partnership and not subject to income tax. Income and deductions associated with Altus Midstream and the Altus Midstream Entities flow through to the Company. As such, Altus Midstream and the Altus Midstream Entities do not record a federal income tax provision.

The Company, Altus Midstream, and the Altus Midstream Entities are also subject to the Texas margin tax. The Texas margin tax is assessed on corporations, limited liability companies, and limited partnerships. As such, each entity recognizes state deferred tax assets and liabilities based on the differences between the financial statement carrying value and tax basis of assets and liabilities on the balance sheet.

The Company routinely assesses the ability to realize its deferred tax assets. If the Company concludes that it is more likely than not that some or all of the deferred tax assets will not be realized, the tax asset is reduced by a valuation allowance. In connection with this assessment, the Company maintained a full valuation allowance against its net deferred tax asset as of December 31, 2021 and 2020.

Historically, the Company reported income and loss from equity method interests on a one-month reporting lag. Effective October 1, 2019, the Company eliminated this one-month reporting lag. In accordance with ASC 810-10-45-13, “A Change in the Fiscal Year-End Lag Between Subsidiary and Parent” (ASC 810), the elimination of this previously existing reporting lag is considered a voluntary change in accounting principle in accordance with ASC 250-10-50, “Change in Accounting Principle.” The Company believes that this change in accounting principle is preferable as it provides the Company with the ability to present the results of its equity method interests for the same period as all other consolidated results of the Company, which improves overall financial reporting to investors by providing the most current information available. The Company has not retrospectively applied the change in accounting principle since its impact to the consolidated balance sheet and related statements of operations and cash flows was immaterial for all periods. For more information on equity method interests owned by the Company, please refer to Note 9—Equity Method Interests.

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848),” which provides optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of the London Interbank Offered Rate (LIBOR) or by another reference rate expected to be discontinued. In January 2021, the FASB issued ASU 2021-01, which clarified the scope and application of the original guidance. The guidance

In August 2020, the FASB issued ASU 2020-06, “Debt-Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging-Contracts in Entity’s Own Equity (Subtopic 815-40)” to improve financial reporting associated with accounting for convertible instruments and contracts in an entity’s own equity. This update is effective for the Company beginning in the first quarter of 2022, with early adoption permitted, using either the modified or fully retrospective method with a cumulative effect adjustment to the opening balance of retained earnings. The Company will adopt this ASU in the first quarter of 2022 and does not believe it will have a material impact on its financial statements.