CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (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 income (loss)	$ 28,925	$ (157,736)	$ (97,628)	$ (163,565)
Other comprehensive income (loss):
Derivative settlements reclassified to earnings	570	9,777	6,882	28,101
Unrealized (loss) income - change in fair value of derivatives	(5,664)	7,999	11,506	(7,658)
Total other comprehensive (loss) income	(5,094)	17,776	18,388	20,443
Comprehensive income (loss)	$ 23,831	$ (139,960)	$ (79,240)	$ (143,122)