CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues and other income:
Revenues and other income	$ 547,769,000	$ 845,816,000	$ 2,013,821,000	$ 2,361,898,000
Derivative fair value income (loss)	74,676,000	(34,591,000)	208,190,000	(151,890,000)
Total revenues and other income	622,445,000	811,225,000	2,222,011,000	2,210,008,000
Costs and expenses:
Production and ad valorem taxes	7,805,000	9,427,000	29,004,000	29,493,000
Brokered natural gas and marketing	79,938,000	116,080,000	313,360,000	274,421,000
Exploration	11,013,000	8,299,000	27,333,000	23,517,000
Abandonment and impairment of unproved properties	16,202,000	6,549,000	41,631,000	73,244,000
General and administrative	41,047,000	43,722,000	138,316,000	159,722,000
Termination costs	819,000	(336,000)	3,025,000	(373,000)
Deferred compensation plan	(8,871,000)	223,000	(16,432,000)	(559,000)
Interest	46,997,000	54,801,000	150,261,000	161,048,000
Gain on early extinguishment of debt	(2,985,000)	0	(2,985,000)	0
Depletion, depreciation and amortization	137,751,000	164,266,000	417,974,000	487,558,000
Impairment of proved properties	0	0	0	22,614,000
Loss (gain) on the sale of assets	36,341,000	30,000	30,663,000	(149,000)
Total costs and expenses	697,245,000	738,549,000	2,134,420,000	2,153,772,000
(Loss) income before income taxes	(74,800,000)	72,676,000	87,591,000	56,236,000
Income tax (benefit) expense:
Current	4,079,000	0	4,079,000	0
Deferred	(51,298,000)	24,137,000	(5,511,000)	38,295,000
Total (benefit) expense for income taxes	(47,219,000)	24,137,000	(1,432,000)	38,295,000
Net (loss) income	$ (27,581,000)	$ 48,539,000	$ 89,023,000	$ 17,941,000
Net (loss) income per common share:
Basic	$ (0.11)	$ 0.19	$ 0.35	$ 0.07
Diluted	(0.11)	0.19	0.35	0.07
Dividends paid per common share	$ 0.02	$ 0.02	$ 0.06	$ 0.06
Weighted average common shares outstanding:
Basic	248,082	246,451	247,878	246,016
Diluted	248,082	247,166	248,823	246,879
Natural Gas, NGLs and Oil Sales
Revenues and other income:
Revenues and other income	$ 474,754,000	$ 736,431,000	$ 1,709,987,000	$ 2,094,450,000
Brokered Natural Gas, Marketing and Other
Revenues and other income:
Revenues and other income	73,015,000	109,385,000	303,834,000	267,448,000
Direct Operating
Costs and expenses:
Costs and expenses	35,276,000	30,926,000	102,484,000	104,136,000
Transportation, Gathering, Processing and Compression
Costs and expenses:
Costs and expenses	$ 295,912,000	$ 304,562,000	$ 899,786,000	$ 819,100,000