CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues and other income:
Natural gas, NGLs and oil sales	$ 477,517	$ 437,678	$ 1,049,534	$ 835,917
Derivative fair value (loss) income	(24,109)	137,760	(170,959)	37,885
Gain on the sale of assets	282,064	83,287	281,711	83,121
Brokered natural gas, marketing and other	30,052	14,631	62,580	35,672
Total revenues and other income	765,524	673,356	1,222,866	992,595
Costs and expenses:
Direct operating	34,935	32,636	74,730	62,824
Transportation, gathering and compression	76,809	66,048	150,970	128,464
Production and ad valorem taxes	10,844	11,113	22,522	22,496
Brokered natural gas and marketing	34,775	16,662	68,904	38,977
Exploration	13,621	13,068	28,467	29,848
Abandonment and impairment of unproved properties	9,332	19,156	19,327	34,374
General and administrative	56,888	101,987	106,100	186,045
Deferred compensation plan	10,519	(6,878)	8,484	35,482
Interest expense	45,488	45,071	90,889	87,281
Loss on early extinguishment of debt	24,596	12,280	24,596	12,280
Depletion, depreciation and amortization	133,361	119,995	262,043	235,096
Impairment of proved properties and other assets	24,991	741	24,991	741
Total costs and expenses	476,159	431,879	882,023	873,908
Income from operations before income taxes	289,365	241,477	340,843	118,687
Income tax expense (benefit)
Current	(1)	(25)	5
Deferred	117,977	97,519	136,928	50,314
Total income tax expense (benefit)	117,976	97,494	136,933	50,314
Net income	$ 171,389	$ 143,983	$ 203,910	$ 68,373
Net income per common share:
Basic	$ 1.04	$ 0.88	$ 1.24	$ 0.42
Diluted	$ 1.04	$ 0.88	$ 1.24	$ 0.42
Dividends paid per common share	$ 0.04	$ 0.04	$ 0.08	$ 0.08
Weighted average common shares outstanding:
Basic	161,909	160,565	161,354	160,346
Diluted	162,813	161,414	162,323	161,223