CONSOLIDATED STATEMENTS OFCASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss) including noncontrolling interests		$ 99,221	$ 81,684	$ (1,327,720)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Unrealized derivative instrument (gain) loss		(82,114)	36,080	8,470
Depreciation and accretion		16,201	15,945	41,480
Deferred income tax expense		0	0	64,915
Income from equity method interests, net		(113,764)	(58,739)	(19,069)
Distributions from equity method interests		133,974	80,747	25,316
Impairments		441	1,643	1,300,719
Impairment on equity method interests		160,441	0	0
Power credit, net		(5,701)	0	0
Warrants valuation adjustment		(664)	(1,200)	(11,180)
Other		2,741	3,368	907
Changes in operating assets and liabilities:
(Increase) decrease in inventories		356	430	(620)
(Increase) decrease in prepaid assets and other		217	(56)	3,877
Increase in accounts receivable		(1,216)	(1,033)	0
(Increase) decrease in revenue receivables (Note 2)		(2,339)	4,083	(4,532)
(Increase) decrease in account receivables from/payable to affiliate		(8,174)	1,043	(6,361)
Increase in accrued expenses		9,353	280	71
Increase in deferred charges, deferred credits and other noncurrent liabilities		746	19	0
NET CASH PROVIDED BY OPERATING ACTIVITIES		209,719	164,294	76,273
CASH FLOWS FROM INVESTING ACTIVITIES:
Capital expenditures		(4,588)	(29,981)	(342,650)
Proceeds from sale of assets		3,037	10,240	13,309
Contributions to equity method interests		(28,420)	(327,305)	(501,352)
Distributions from equity method interests		38,755	17,419	0
Acquisition of equity method interests		0	0	(670,625)
Capitalized interest paid		0	(8,733)	(2,370)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES		8,784	(338,360)	(1,503,688)
CASH FLOWS FROM FINANCING ACTIVITIES:
Redeemable noncontrolling interest - Preferred Unit limited partners, net		0	0	611,249
Distributions paid to Preferred Unit limited partners		(46,249)	(23,124)	0
Distributions paid to Apache limited partner		(75,000)	0	0
Dividends paid		(22,479)	0	0
Proceeds from revolving credit facility		33,000	228,000	396,000
Finance lease		0	(11,789)	(22,994)
Deferred facility fees		0	(816)	(792)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES		(110,728)	192,271	983,463
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		107,775	18,205	(443,952)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR		24,188	5,983	449,935
CASH AND CASH EQUIVALENTS AT END OF PERIOD		131,963	24,188	5,983
SUPPLEMENTAL CASH FLOW DATA:
Accrued capital expenditures	[1]	514	834	18,573
Finance lease liability	[2]	0	0	9,767
Interest paid, net of capitalized interest		9,540	1,013	903
Cash received for income tax refunds		$ 0	$ 696	$ 527

[1] Includes $0.8 million due from Apache and $0.4 million and $1.5 million due to Apache of capital expenditures for the years ended December 31, 2021, 2020, and 2019, respectively, pursuant to the terms of the Construction, Operations, and Maintenance Agreement entered into at the closing of the Altus Combination. Refer to Note 2—Transactions with Affiliates for more information.

[2] The Company entered into a finance lease in the first quarter of 2019 for power generators, which ended during the first quarter of 2020. The Company then exercised its option to purchase the generators.