TRANSACTIONS WITH AFFILIATES (Notes)	12 Months Ended
TRANSACTIONS WITH AFFILIATES (Notes)	Dec. 31, 2021
Related Party Transactions [Abstract]
TRANSACTIONS WITH AFFILIATES	TRANSACTIONS WITH AFFILIATES Revenues The Company has contracted to provide services including gas gathering, compression, processing, transmission, and NGL transmission, pursuant to acreage dedications provided by Apache, comprising the entire Alpine High acreage. In accordance with the terms of these agreements, the Company receives prescribed fees and may receive excess recovery volumes based on the type and volume of product for which the services are provided. Additionally, beginning in 2020 Altus Midstream entered into three agreements to provide operating and maintenance services for Apache’s compressors in exchange for a fixed monthly fee per compressor serviced. Revenues generated under these agreements are presented on the Company’s statement of consolidated operations as “Midstream services revenue — affiliate.” Revenues earned that have not yet been invoiced to Apache are presented on the Company’s consolidated balance sheet as “Revenue receivables.” Refer to Note 3—Revenue Recognition, for further discussion. Cost and Expenses The Company has no employees, and prior to the Altus Combination, the Company had no banking or cash management facilities. As such, the Company has contracted with Apache to receive certain operational, maintenance, and management services. In accordance with the terms of these agreements, the Company incurred operations and maintenance expenses of $5.6 million, $5.4 million, and $8.8 million for the years ended December 31, 2021, 2020, and 2019, respectively. The Company incurred general and administrative expenses of $9.1 million, $7.0 million, and $5.4 million for the years ended December 31, 2021, 2020, and 2019, respectively, including expenses related to the operational services agreement and the COMA. Further information on the related-party agreements in place during the period is provided below. Construction, Operations, and Maintenance Agreement At the closing of the Altus Combination, the Company entered into the COMA with Apache. Under the terms of the COMA, Apache provides certain services related to the design, development, construction, operation, management, and maintenance of certain gathering, processing and other midstream assets, on behalf of the Company. In return, the Company paid or will pay fees to Apache of (i) $3.0 million for the period beginning on the execution of the COMA at the closing of the Altus Combination through December 31, 2019, (ii) $5.0 million for the period of January 1, 2020 through December 31, 2020, (iii) $7.0 million for the period of January 1, 2021 through December 31, 2021 and (iv) $9.0 million annually thereafter, adjusted based on actual internal overhead and general and administrative costs incurred, until terminated. The annual fee was negotiated as part of the Altus Combination to reimburse Apache for indirect costs of performing administrative corporate functions for the Company, including services for information technology, risk management, corporate planning, accounting, cash management, and others. In addition, Apache may be reimbursed for certain internal costs and third-party costs incurred in connection with its role as service provider under the COMA. Costs incurred by Apache directly associated with midstream activity, where substantially all the services are rendered for Altus Midstream, are charged to Altus Midstream on a monthly basis. The COMA stipulates that the Company shall provide reimbursement of amounts owing to Apache attributable to a particular month by no later than the last day of the immediately following month. Unpaid amounts accrue interest until settled. The COMA will continue to be effective until terminated (i) upon the mutual consent of Altus and Apache, (ii) by either of Altus and Apache, at its option, upon 30 days’ prior written notice in the event Apache or an affiliate no longer owns a direct or indirect interest in at least 50 percent of the voting or other equity securities of Altus, or (iii) by Altus if Apache fails to perform any of its covenants or obligations due to willful misconduct of certain key personnel and such failure has a material adverse financial impact on Altus. Lease Agreements Concurrent with the closing of the Altus Combination, Altus Midstream entered into an operating lease agreement with Apache (the Lease Agreement) relating to the use of certain office buildings, warehouse and storage facilities located in Reeves County, Texas. Under the terms of the Lease Agreement, Altus Midstream shall pay to Apache on a monthly basis the sum of (i) a base rental charge of $44,500 and (ii) an amount based on Apache’s estimate of the annual costs it expects to incur in connection with the ownership, operation, repair, and/or maintenance of the facilities. The Company incurred total expenses of $0.6 million, $0.8 million and $1.1 million for the years ended December 31, 2021, 2020 and 2019, respectively, in relation to the Lease Agreement, which are included within operations and maintenance expenses. Unpaid amounts accrue interest until settled. The initial term of the Lease Agreement is four years and may be extended by Altus Midstream for three additional, consecutive periods of twenty-four months. To accommodate Altus Midstream’s desire to vacate the leased premises, the Lease Agreement was amended in July 2020 to provide for its termination with respect to all or any portion of the leased premises which Apache may sell, with a pro rata rent reduction if Apache sells less than all of the leased premises. The Company classified this lease as an operating lease and elected to account for lessee-related lease and non-lease components as a single lease component. The right-of-use (ROU) asset related to this lease is reflected within “Deferred charges and other” on the Company’s consolidated balance sheet, and the associated operating lease liability is reflected within “Other current liabilities” and “Other noncurrent liabilities,” as applicable. Operating lease expense associated with ROU assets is recognized on a straight-line basis over the lease term. Lease expense is reflected on the consolidated statement of operations commensurate with the leased activities and nature of the services performed. The remaining undiscounted future minimum lease payment as of December 31, 2021 is $0.4 million, which will be paid in 2022. In 2020 and 2021, Altus Midstream entered into various operating lease agreements with Apache related to the use of certain of Altus Midstream’s compressors. Under the terms of the agreement, Apache pays Altus Midstream fixed monthly lease payments, which are recorded as “Other” in the Company’s consolidated statement of operations. Each of the lease agreements has an initial term of thirty months and automatically extends on a month-to-month basis unless either party cancels the agreement. The Company recorded income related to these agreements of $1.6 million and $0.4 million for the years ended December 31, 2021 and 2020, respectively. Altus also earns a monthly fee to operate and maintain the compressors under lease. Refer to Note 3—Revenue Recognition for further discussion. 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. Altus Combination Agreements Limited Partnership Agreement of Altus Midstream LP In connection with the Altus Combination, Altus Midstream Company, Altus Midstream GP, Altus Midstream LP, and Apache entered into an amended and restated limited partnership agreement of Altus Midstream LP, which was further amended in connection with the subsequent issuance of Preferred Units. The Amended LPA sets forth, among other things, the rights and obligations of (i) Altus Midstream GP as general partner and (ii) Altus Midstream Company, Apache, and Preferred Unit holders as limited partners of Altus Midstream LP. Altus Midstream GP is not entitled to reimbursement for its services as general partner. Refer to Note 1—Summary of Significant Accounting Policies and Note 11—Series A Cumulative Redeemable Preferred Units, for further information. Purchase Rights and Restrictive Covenants Agreement At the closing of the Altus Combination, the Company entered into a purchase rights and restrictive covenants agreement (the Purchase Rights and Restrictive Covenants Agreement) with Apache. Under the Purchase Rights and Restrictive Covenants Agreement, until the later of the five-year anniversary of the Closing and the date on which Apache and its affiliates cease to own a majority of the Company’s voting common stock, Apache is obligated to provide (i) the first right to pursue any opportunity (including any expansion opportunities) of Apache to acquire or invest, directly or indirectly (including equity investments), in any midstream assets or participate in any midstream opportunities located, in whole or part, within an area covering approximately 1.7 million acres in Reeves, Pecos, Brewster, Culberson, and Jeff Davis Counties in Texas, and (ii) a right of first offer on certain retained midstream assets of Apache.