Statements of Condensed Consolidated Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating revenues:
Sales of natural gas, natural gas liquids and oil	$ 598,992	$ 769,627	$ 1,812,965	$ 2,941,767
(Loss) gain on derivatives not designated as hedges	(427,182)	180,313	(11,320)	455,952
Net marketing services and other	317	1,636	4,613	7,282
Total operating revenues	172,127	951,576	1,806,258	3,405,001
Operating expenses:
Transportation and processing	427,691	437,942	1,273,161	1,314,172
Production	39,670	37,821	118,379	117,545
Exploration	3,160	3,492	4,959	6,356
Selling, general and administrative	56,330	79,376	134,609	214,562
Depreciation and depletion	341,027	390,993	1,021,649	1,154,519
Amortization of intangible assets	7,478	7,755	22,433	28,439
Loss on sale/exchange of long-lived assets	4,662	13,935	102,721	13,935
Impairment of intangible assets	0	15,411	0	15,411
Impairment and expiration of leases	50,449	49,601	145,496	127,719
Transaction, proxy and reorganization	1,855	76,779	6,600	102,386
Total operating expenses	932,322	1,113,105	2,830,007	3,095,044
Operating (loss) income	(760,195)	(161,529)	(1,023,749)	309,957
Gain on Equitrans Share Exchange (see Note 9)	0	0	(187,223)	0
(Gain) loss on investment in Equitrans Midstream Corporation	(3,801)	261,093	303,844	276,779
Dividend and other income	(2,900)	(22,960)	(31,204)	(67,592)
Loss on debt extinguishment	3,749	0	20,712	0
Interest expense	69,154	47,709	196,914	154,785
Loss before income taxes	(826,397)	(447,371)	(1,326,792)	(54,015)
Income tax benefit	(225,757)	(86,343)	(295,938)	(9,244)
Net loss	$ (600,640)	$ (361,028)	$ (1,030,854)	$ (44,771)
Basic:
Weighted average common stock outstanding (in shares)	255,589	255,235	255,516	255,069
Net (loss) income (in dollars per share)	$ (2.35)	$ (1.41)	$ (4.03)	$ (0.18)
Diluted:
Weighted average common stock outstanding (in shares)	255,589	255,235	255,516	255,069
Net (loss) income (in dollars per share)	$ (2.35)	$ (1.41)	$ (4.03)	$ (0.18)
Sales of natural gas, natural gas liquids and oil
Operating revenues:
Sales of natural gas, natural gas liquids and oil	$ 598,992	$ 769,627	$ 1,812,965	$ 2,941,767
(Loss) gain on derivatives not designated as hedges
Operating revenues:
(Loss) gain on derivatives not designated as hedges	$ (427,182)	$ 180,313	$ (11,320)	$ 455,952