CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues and other income:
Natural gas, NGLs and oil sales	$ 258,053	$ 477,517	$ 583,536	$ 1,049,534
Derivative fair value (loss) income	(34,791)	(24,109)	88,048	(170,959)
Gain on the sale of assets	2,909	282,064	2,734	281,711
Brokered natural gas, marketing and other	21,339	30,052	35,824	62,580
Total revenues and other income	247,510	765,524	710,142	1,222,866
Costs and expenses:
Direct operating	34,780	34,935	71,917	74,730
Transportation, gathering and compression	95,198	76,809	184,624	150,970
Production and ad valorem taxes	9,242	10,844	19,170	22,522
Brokered natural gas and marketing	27,031	34,775	48,593	68,904
Exploration	5,025	13,621	12,911	28,467
Abandonment and impairment of unproved properties	12,330	9,332	23,821	19,327
General and administrative	55,964	56,888	104,293	106,100
Termination costs	417	0	6,367	0
Deferred compensation plan	(7,282)	10,519	(12,906)	8,484
Interest	43,479	45,488	82,686	90,889
Loss on early extinguishment of debt		24,596		24,596
Depletion, depreciation and amortization	151,895	133,361	299,185	262,043
Impairment of proved properties and other assets		24,991		24,991
Total costs and expenses	428,079	476,159	840,661	882,023
(Loss) income before income taxes	(180,569)	289,365	(130,519)	340,843
Income tax (benefit) expense:
Current	0	(1)	0	5
Deferred	(61,975)	117,977	(39,609)	136,928
Total income tax expense (benefit)	(61,975)	117,976	(39,609)	136,933
Net (loss) income	$ (118,594)	$ 171,389	$ (90,910)	$ 203,910
Net (loss) income per common share:
Basic	$ (0.71)	$ 1.04	$ (0.55)	$ 1.24
Diluted	(0.71)	1.04	(0.55)	1.24
Dividends paid per common share	$ 0.04	$ 0.04	$ 0.08	$ 0.08
Weighted average common shares outstanding:
Basic	166,421	161,909	166,230	161,354
Diluted	166,421	162,813	166,230	162,323