CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues and other income:
Natural gas, NGLs and oil sales	$ 437,678	$ 298,349	$ 835,917	$ 615,966
Derivative fair value income	137,760	148,569	37,885	87,736
Gain (loss) on the sale of assets	83,287	(3,227)	83,121	(13,653)
Brokered natural gas, marketing and other	14,631	5,240	35,672	9,837
Total revenues and other income	673,356	448,931	992,595	699,886
Costs and expenses:
Direct operating	32,636	27,041	62,824	56,063
Transportation, gathering and compression	66,048	44,744	128,464	85,564
Production and ad valorem taxes	11,113	11,786	22,496	48,420
Brokered natural gas and marketing	16,662	6,491	38,977	10,553
Exploration	13,068	15,517	29,848	37,033
Abandonment and impairment of unproved properties	19,156	43,641	34,374	63,930
General and administrative	101,987	44,005	186,045	82,734
Deferred compensation plan	(6,878)	9,333	35,482	1,503
Interest expense	45,071	42,888	87,281	80,093
Loss on early extinguishment of debt	12,280		12,280
Depletion, depreciation and amortization	120,736	108,802	235,837	208,953
Total costs and expenses	431,879	354,248	873,908	674,846
Income from operations before income taxes	241,477	94,683	118,687	25,040
Income tax expense (benefit)
Current	(25)
Deferred	97,519	39,007	50,314	11,164
Total income tax expense	97,494	39,007	50,314	11,164
Net income	$ 143,983	$ 55,676	$ 68,373	$ 13,876
Net income per common share:
Basic	$ 0.88	$ 0.34	$ 0.42	$ 0.09
Diluted	$ 0.88	$ 0.34	$ 0.42	$ 0.09
Dividends per common share	$ 0.04	$ 0.04	$ 0.08	$ 0.08
Weighted average common shares outstanding:
Basic	160,565	159,412	160,346	159,162
Diluted	161,414	160,030	161,223	159,949