Statements of Condensed Consolidated Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net (loss) income	$ (430,214)	$ 316,257
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Deferred income tax benefit	24,987	76,597
Depreciation and depletion	680,622	763,526
Amortization of intangible assets	14,955	20,684
Impairment of leases and loss on sale/exchange of long-lived assets	193,106	78,118
Gain on Equitrans Share Exchange	(187,223)	0
(Gain) loss on investment in Equitrans Midstream Corporation	307,645	15,686
Loss on debt extinguishment	16,963	0
Share-based compensation expense	8,123	9,501
Amortization, accretion and other	12,614	12,408
Gain on derivatives not designated as hedges	(415,862)	(275,639)
Cash settlements received (paid) on derivatives not designated as hedges	561,129	(10,490)
Net premiums (paid) received on derivative instruments	(53,473)	26,406
Changes in other assets and liabilities:
Accounts receivable	206,322	467,055
Accounts payable	(85,973)	(253,463)
Tax receivable	96,920	4,186
Other items, net	(3,520)	64,001
Net cash provided by operating activities	947,121	1,314,833
Cash flows from investing activities:
Capital expenditures	(512,095)	(765,781)
Proceeds from sale of assets	110,937	0
Cash received for Equitrans Share Exchange	52,323	0
Other investing activities	(135)	1,152
Net cash used in investing activities	(348,970)	(764,629)
Cash flows from financing activities:
Proceeds from borrowings on credit facility	781,000	1,395,750
Repayment of borrowings on credit facility	(1,037,000)	(2,195,750)
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	(2,507,074)	(702,298)
Premiums paid on debt extinguishment	(13,635)	0
Dividends paid	(7,664)	(15,317)
Cash paid for taxes related to net settlement of share-based incentive awards	(304)	(4,993)
Net cash used in financing activities	(599,779)	(523,521)
Net change in cash and cash equivalents	(1,628)	26,683
Cash and cash equivalents at beginning of period	4,596	3,487
Cash and cash equivalents at end of period	2,968	30,170
Non-cash activity during the period for:
Increase in right-of-use lease assets and liabilities	1,697	89,021
Increase in asset retirement costs and obligations	6,596	2,456
Cash paid (received) during the period for:
Interest, net of amount capitalized	74,596	109,713
Income taxes, net	(191,598)	(2,394)
Share-based Payment Arrangement, Amount Capitalized	$ 1,611	$ 0