CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues and other income:
Natural gas, NGLs and oil sales	$ 696,629,000	$ 559,450,000
Derivative fair value (loss) income	(14,009,000)	165,557,000
Brokered natural gas, marketing and other	59,979,000	51,648,000
Total revenues and other income	742,599,000	776,655,000
Costs and expenses:
Direct operating	38,122,000	28,023,000
Transportation, gathering, processing and compression	244,628,000	177,648,000
Production and ad valorem taxes	9,926,000	9,163,000
Brokered natural gas and marketing	55,594,000	53,550,000
Exploration	7,719,000	8,504,000
Abandonment and impairment of unproved properties	11,773,000	4,420,000
General and administrative	68,417,000	47,496,000
Termination costs	(37,000)	4,192,000
Deferred compensation plan	(7,397,000)	(13,169,000)
Interest	52,385,000	47,101,000
Depletion, depreciation and amortization	162,266,000	149,821,000
Impairment of proved properties	7,312,000	0
Gain on the sale of assets	(23,000)	(22,600,000)
Total costs and expenses	650,685,000	494,149,000
Income before income taxes	91,914,000	282,506,000
Income tax expense:
Current	0	0
Deferred	42,676,000	112,395,000
Total (benefit) expense for income taxes	42,676,000	112,395,000
Net income	$ 49,238,000	$ 170,111,000
Net income per common share:
Basic	$ 0.20	$ 0.69
Diluted	0.20	0.69
Dividends paid per common share	$ 0.02	$ 0.02
Weighted average common shares outstanding:
Basic	245,709	244,652
Diluted	246,594	244,803