Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net income (loss)		$ 429,512	$ (8,059)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		268,402	252,124
Long-lived asset and other impairments		27,604	165,935
Goodwill impairment		0	441,017
Non-cash equity-based compensation expense		13,855	10,911
Deferred income taxes		1,273	799
Accretion and amortization of long-term obligations, net		4,002	4,297
Equity income, net – related parties		(110,831)	(115,762)
Distributions from equity-investment earnings – related parties		110,763	124,156
(Gain) loss on divestiture and other, net		(642)	2,883
(Gain) loss on early extinguishment of debt		289	(8,740)
Cash paid to settle interest-rate swaps		0	(12,763)
Other		41	710
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net		(69,164)	(200,136)
Increase (decrease) in accounts and imbalance payables and accrued liabilities, net		39,291	72,323
Change in other items, net		(734)	9,304
Net cash provided by operating activities		713,661	738,999
Cash flows from investing activities
Capital expenditures		(137,928)	(313,065)
Contributions to equity investments – related parties		(3,508)	(16,064)
Distributions from equity investments in excess of cumulative earnings – related parties		21,373	13,340
Proceeds from the sale of assets to third parties		8,003	0
(Increase) decrease in materials and supplies inventory and other		7,656	(39,212)
Net cash used in investing activities		(106,404)	(355,001)
Cash flows from financing activities
Borrowings, net of debt issuance costs		100,000	3,586,173
Repayments of debt		(531,085)	(3,583,149)
Increase (decrease) in outstanding checks		(29,102)	(4,686)
Distributions to Partnership unitholders	[1]	(264,234)	(422,679)
Net contributions from (distributions to) related parties		4,508	21,832
Finance lease payments	[2]	(3,639)	(10,262)
Unit repurchases		(16,241)	0
Net cash provided by (used in) financing activities		(746,606)	(424,222)
Net increase (decrease) in cash and cash equivalents		(139,349)	(40,224)
Cash and cash equivalents at beginning of period		444,922	99,962
Cash and cash equivalents at end of period		305,573	59,738
Supplemental disclosures
Interest paid, net of capitalized interest		188,280	163,362
Taxes paid (reimbursements received)		932	(384)
Accrued capital expenditures		27,592	43,191
Chipeta [Member]
Cash flows from financing activities
Distributions to Chipeta noncontrolling interest owner		(1,521)	(2,775)
WES Operating [Member]
Cash flows from financing activities
Distributions to noncontrolling interest owner of WES Operating		(5,292)	(8,676)
Related Parties [Member]
Cash flows from investing activities
Acquisitions from related parties		(2,000)	0
Cash flows from financing activities
Distributions to Partnership unitholders		(130,518)	(225,914)
Finance lease payments		0	(6,382)
Related Parties [Member] | WES Operating [Member]
Cash flows from financing activities
Distributions to Partnership unitholders		$ (5,292)	$ (8,676)

[1] See Note 6.

[2] For the six months ended June 30, 2020, includes related-party payments of $6.4 million.