CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Net (loss) income	$ (53,836)		$ 34,755		$ (39,960)		$ 61,015
Other comprehensive income:
Realized loss (gain) on hedge derivative contract settlements reclassified into earnings from other comprehensive income, net of taxes	(37,495)	[1]	(16,724)	[1]	(120,871)	[1]	(55,791)	[1]
Change in unrealized deferred hedging (losses) gains, net of taxes	(52,246)		56,993		31,541		74,530
Total comprehensive (loss) income	$ (143,577)		$ 75,024		$ (129,290)		$ 79,754

[1] For realized gains upon derivative contract settlement, the reduction in AOCI is offset by an increase in natural gas, NGLs and oil sales. For realized losses upon derivative contract settlement, the increase in AOCI is offset by a decrease in natural gas, NGLs and oil sales.