CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues and other income:
Revenues and other income	$ 684,405,000	$ 382,849,000	$ 1,368,316,000	$ 843,594,000
Derivative fair value (loss) income	(249,683,000)	(6,303,000)	(307,562,000)	226,872,000
Total revenues and other income	434,722,000	376,546,000	1,060,754,000	1,070,466,000
Costs and expenses:
Production and ad valorem taxes	8,414,000	5,557,000	13,039,000	14,576,000
Brokered natural gas and marketing	69,004,000	38,161,000	141,339,000	70,785,000
Exploration	5,028,000	8,027,000	10,566,000	15,104,000
Abandonment and impairment of unproved properties	2,177,000	5,524,000	5,206,000	10,937,000
General and administrative	40,242,000	38,288,000	78,246,000	80,542,000
Exit and termination costs	(15,946,000)	10,297,000	(2,232,000)	11,892,000
Deferred compensation plan	35,462,000	12,587,000	55,273,000	4,050,000
Interest	57,287,000	48,624,000	114,165,000	96,142,000
Loss (gain) on early extinguishment of debt	63,000	(8,991,000)	98,000	(21,914,000)
Depletion, depreciation and amortization	90,629,000	104,626,000	179,012,000	207,612,000
Impairment of proved properties	0	0	0	77,000,000
(Gain) loss on the sale of assets	(2,506,000)	426,000	(646,000)	(121,673,000)
Total costs and expenses	592,456,000	566,395,000	1,188,648,000	1,065,122,000
(Loss) income before income taxes	(157,734,000)	(189,849,000)	(127,894,000)	5,344,000
Income tax expense (benefit):
Current	2,569,000	(3,000)	2,737,000	(366,000)
Deferred	(3,831,000)	(22,263,000)	(1,310,000)	7,098,000
Total (benefit) expense for income taxes	(1,262,000)	(22,266,000)	1,427,000	6,732,000
Net loss	$ (156,472,000)	$ (167,583,000)	$ (129,321,000)	$ (1,388,000)
Net loss per common share:
Basic	$ (0.65)	$ (0.70)	$ (0.53)	$ (0.01)
Diluted	$ (0.65)	$ (0.70)	$ (0.53)	$ (0.01)
Weighted average common shares outstanding:
Basic	242,592	239,472	242,377	242,717
Diluted	242,592	239,472	242,377	242,717
Natural Gas, NGLs and Oil Sales
Revenues and other income:
Revenues and other income	$ 621,855,000	$ 349,258,000	$ 1,225,202,000	$ 781,354,000
Brokered Natural Gas, Marketing and Other
Revenues and other income:
Revenues and other income	62,550,000	33,591,000	143,114,000	62,240,000
Direct Operating
Costs and expenses:
Costs and expenses	19,758,000	24,394,000	37,408,000	56,429,000
Transportation, Gathering, Processing and Compression
Costs and expenses:
Costs and expenses	$ 282,844,000	$ 278,875,000	$ 557,174,000	$ 563,640,000