CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues and other income:
Revenues and other income	$ 845,816,000		$ 2,361,898,000
Derivative fair value (loss) income	(34,591,000)	$ (88,426,000)	(151,890,000)	$ 188,326,000
Total revenues and other income	811,225,000	482,232,000	2,210,008,000	1,931,998,000
Costs and expenses:
Production and ad valorem taxes	9,427,000	11,993,000	29,493,000	31,125,000
Brokered natural gas and marketing	116,080,000	59,773,000	274,421,000	169,180,000
Exploration	8,299,000	22,767,000	23,517,000	45,769,000
Abandonment and impairment of unproved properties	6,549,000	42,568,000	73,244,000	52,181,000
General and administrative	43,722,000	53,035,000	159,722,000	152,853,000
Termination costs	(336,000)	(47,000)	(373,000)	4,049,000
Deferred compensation plan	223,000	(9,203,000)	(559,000)	(36,838,000)
Interest	54,801,000	49,179,000	161,048,000	144,206,000
Depletion, depreciation and amortization	164,266,000	159,749,000	487,558,000	462,074,000
Impairment of proved properties	0	63,679,000	22,614,000	63,679,000
Loss (gain) on the sale of assets	30,000	(102,000)	(149,000)	(23,509,000)
Total costs and expenses	738,549,000	681,924,000	2,153,772,000	1,721,983,000
Income (loss) before income taxes	72,676,000	(199,692,000)	56,236,000	210,015,000
Income tax expense (benefit):
Current	0	0	0	0
Deferred	24,137,000	(71,992,000)	38,295,000	98,054,000
Total expense (benefit) for income taxes	24,137,000	(71,992,000)	38,295,000	98,054,000
Net income (loss)	$ 48,539,000	$ (127,700,000)	$ 17,941,000	$ 111,961,000
Net income (loss) per common share:
Basic	$ 0.19	$ (0.52)	$ 0.07	$ 0.45
Diluted	0.19	(0.52)	0.07	0.45
Dividends paid per common share	$ 0.02	$ 0.02	$ 0.06	$ 0.06
Weighted average common shares outstanding:
Basic	246,451	245,244	246,016	245,027
Diluted	247,166	245,244	246,879	245,280
Natural Gas, NGLs and Oil Sales
Revenues and other income:
Revenues and other income	$ 736,431,000	$ 507,541,000	$ 2,094,450,000	$ 1,573,128,000
Brokered Natural Gas, Marketing and Other
Revenues and other income:
Revenues and other income	109,385,000	63,117,000	267,448,000	170,544,000
Direct Operating
Costs and expenses:
Costs and expenses	30,926,000	36,888,000	104,136,000	96,331,000
Transportation, Gathering, Processing and Compression
Costs and expenses:
Costs and expenses	$ 304,562,000	$ 191,645,000	$ 819,100,000	$ 560,883,000