CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenues and other income:
Natural gas, NGLs and oil sales	$ 398,239	$ 317,617
Derivative fair value loss	(99,875)	(60,833)
Loss on the sale of assets	(166)	(10,426)
Brokered natural gas, marketing and other	21,041	4,597
Total revenues and other income	319,239	250,955
Costs and expenses:
Direct operating	30,188	29,022
Transportation, gathering and compression	62,416	40,820
Production and ad valorem taxes	11,383	36,634
Brokered natural gas and marketing	22,315	4,062
Exploration	16,780	21,516
Abandonment and impairment of unproved properties	15,218	20,289
General and administrative	84,058	38,729
Deferred compensation plan	42,360	(7,830)
Interest expense	42,210	37,205
Depletion, depreciation and amortization	115,101	100,151
Total costs and expenses	442,029	320,598
Loss from operations before income taxes	(122,790)	(69,643)
Income tax (benefit) expense
Current	25
Deferred	(47,205)	(27,843)
Total income tax expense	(47,180)	(27,843)
Net loss	$ (75,610)	$ (41,800)
Net loss per common share:
Basic	$ (0.47)	$ (0.26)
Diluted	$ (0.47)	$ (0.26)
Dividends per common share	$ 0.04	$ 0.04
Weighted average common shares outstanding:
Basic	160,125	158,913
Diluted	160,125	158,913