Statements of Condensed Consolidated Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net (loss) income	$ (167,139)	$ 190,691
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income tax benefit	127,860	37,889
Depreciation and depletion	357,526	391,113
Amortization of intangible assets	7,478	10,342
Impairment of long-lived assets and leases	102,620	29,534
Gain on Equitrans Share Exchange	(187,223)	0
Loss (gain) on investment in Equitrans Midstream Corporation	390,628	(89,055)
Loss on debt extinguishment	16,610	0
Share-based compensation expense	4,684	3,853
Amortization, accretion and other	3,303	4,624
(Gain) loss on derivatives not designated as hedges	(389,436)	131,996
Cash settlements received (paid) on derivatives not designated as hedges	245,736	(63,634)
Changes in other assets and liabilities:
Accounts receivable	149,057	342,465
Accounts payable	(85,840)	(149,487)
Tax receivable	(92,809)	1,006
Other items, net	17,207	29,950
Net cash provided by operating activities	500,262	871,287
Cash flows from investing activities:
Capital expenditures	(256,156)	(371,028)
Cash received for Equitrans Share Exchange	52,323	0
Other investing activities	140	697
Net cash used in investing activities	(203,693)	(370,331)
Cash flows from financing activities:
Proceeds from borrowings on credit facility	206,000	820,000
Repayment of borrowings on credit facility	(500,000)	(1,270,000)
Proceeds from issuance of debt	1,750,000	0
Debt issuance costs	(15,662)	0
Repayments and retirements of debt	(1,701,224)	(1,141)
Premiums paid on debt extinguishment	(13,660)	0
Dividends paid	(7,664)	(7,652)
Cash paid for taxes related to net settlement of share-based incentive awards	(304)	(4,804)
Net cash used in financing activities	(282,514)	(463,597)
Net change in cash and cash equivalents	14,055	37,359
Cash and cash equivalents at beginning of period	4,596	3,487
Cash and cash equivalents at end of period	18,651	40,846
Cash paid (received) during the period for:
Interest, net of amount capitalized	29,628	13,749
Income taxes, net	(1,950)	23
Non-cash activity during the period for:
Increase in right-of-use lease assets and liabilities	303	89,021
Increase in asset retirement costs and obligations	$ 3,761	$ 1,285