Statements of Condensed Consolidated Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (1,030,854)	$ (44,771)
Adjustments to reconcile net loss to net cash provided by operating activities:
Deferred income tax benefit	(182,244)	(10,407)
Depreciation and depletion	1,021,649	1,154,519
Amortization of intangible assets	22,433	28,439
Impairment of leases and intangible assets and loss on sale/exchange of long-lived assets	248,217	157,065
Gain on Equitrans Share Exchange	(187,223)	0
Loss on investment in Equitrans Midstream Corporation	303,844	276,779
Loss on debt extinguishment	20,712	0
Share-based compensation expense	15,226	29,453
Amortization, accretion and other	25,236	19,385
Loss (gain) on derivatives not designated as hedges	11,320	(455,952)
Cash settlements received on derivatives not designated as hedges	813,218	152,149
Net premiums (paid) received on derivative instruments	(53,473)	22,512
Changes in other assets and liabilities:
Accounts receivable	139,713	508,306
Accounts payable	(62,853)	(286,453)
Tax receivable	248,101	3,784
Other items, net	(221,445)	79,046
Net cash provided by operating activities	1,131,577	1,633,854
Cash flows from investing activities:
Capital expenditures	(788,384)	(1,257,333)
Proceeds from sale of assets	113,236	0
Cash received for Equitrans Share Exchange	52,323	0
Other investing activities	117	1,123
Net cash used in investing activities	(622,708)	(1,256,210)
Cash flows from financing activities:
Proceeds from borrowings on credit facility	1,772,750	2,261,250
Repayment of borrowings on credit facility	(1,822,250)	(2,900,250)
Proceeds from issuance of debt	2,250,000	1,000,000
Debt issuance costs and Capped Call Transactions (See Note 6)	(65,102)	(913)
Repayments and retirements of debt	(2,609,785)	(703,471)
Premiums paid on debt extinguishment	(17,150)	0
Dividends paid	(7,664)	(22,985)
Cash paid for taxes related to net settlement of share-based incentive awards	(596)	(7,220)
Net cash used in financing activities	(499,797)	(373,589)
Net change in cash and cash equivalents	9,072	4,055
Cash and cash equivalents at beginning of period	4,596	3,487
Cash and cash equivalents at end of period	13,668	7,542
Cash paid (received) during the period for:
Interest, net of amount capitalized	145,366	125,817
Income taxes, net	(402,044)	(1,480)
Non-cash activity during the period for:
Increase in right-of-use lease assets and liabilities	3,130	112,141
Increase in asset retirement costs and obligations	9,674	3,610
Capitalization of non-cash equity share-based compensation	$ 2,350	$ 0