Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income (loss)		$ 387,037	$ 248,177	[1]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		235,063	173,278	[1]
Impairments		1,187	127,384	[1]
Non-cash equity-based compensation expense		5,493	3,165	[1]
Deferred income taxes		4,885	48,858	[1]
Accretion and amortization of long-term obligations, net		2,848	3,376	[1]
Equity income, net – affiliates		(121,590)	(79,659)	[1]
Distributions from equity investment earnings – affiliates		115,483	65,525	[1]
(Gain) loss on divestiture and other, net		1,651	(286)	[1]
(Gain) loss on interest-rate swaps		94,585	0	[1]
Lower of cost or market inventory adjustments		169	151	[1]
Changes in assets and liabilities:
(Increase) decrease in accounts receivable, net		2,668	(8,572)	[1]
Increase (decrease) in accounts and imbalance payables and accrued liabilities, net		(81,198)	42,040	[1]
Change in other items, net		38,250	5,889	[1]
Net cash provided by operating activities		686,531	629,326	[1]
Cash flows from investing activities
Capital expenditures		(704,425)	(1,112,474)	[1]
Investments in equity affiliates		(77,333)	(27,490)	[1]
Distributions from equity investments in excess of cumulative earnings – affiliates		17,052	13,632	[1]
Net cash used in investing activities		(2,865,168)	(1,287,904)	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs	[2]	2,710,750	1,525,439	[1]
Repayments of debt	[3]	(467,595)	(630,000)	[1]
Increase (decrease) in outstanding checks		(5,662)	(5,357)	[1]
Registration expenses related to the issuance of WES common units		(855)	0	[1]
Distributions to WES unitholders	[4]	408,234	244,658	[1]
Net contributions from (distributions to) Anadarko		456,938	157,264	[1]
Above-market component of swap agreements with Anadarko	[4]	7,407	28,121	[1]
Net cash provided by (used in) financing activities		2,182,290	634,307	[1]
Net increase (decrease) in cash and cash equivalents		3,653	(24,271)	[1]
Cash and cash equivalents at beginning of period	[1]	92,142	79,588
Cash and cash equivalents at end of period		95,795	55,317	[1]
Supplemental disclosures
Interest paid, net of capitalized interest		137,686	56,784	[1]
Taxes paid (reimbursements received)		96	(87)	[1]
Accrued capital expenditures		141,094	327,777	[1]
Chipeta [Member]
Cash flows from financing activities
Distributions to Chipeta noncontrolling interest owner		(3,793)	(6,421)	[1]
WES Operating [Member]
Cash flows from financing activities
Distributions to noncontrolling interest owner		106,666	190,081	[1]
Affiliates [Member]
Cash flows from investing activities
Acquisitions		(2,007,501)	0	[1]
Cash flows from financing activities
Borrowings, net of debt issuance costs		11,000	187,900
Repayments of debt		(439,600)
Distributions to WES unitholders		255,885	199,571
Affiliates [Member] | WES Operating [Member]
Cash flows from financing activities
Distributions to WES unitholders		8,210	3,731
Third Parties [Member]
Cash flows from investing activities
Acquisitions		(93,303)	(161,858)	[1]
Proceeds from the sale of assets		$ 342	$ 286	[1]

[1] Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.

[2] For the six months ended June 30, 2019 and 2018, includes $11.0 million and $187.9 million of borrowings, respectively, under the APCWH Note Payable.

[3] For the six months ended June 30, 2019, includes a $439.6 million repayment to settle the APCWH Note Payable. See Note 6.

[4] See Note 6.