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)	$ (7,194)	$ 2,316	$ (676)	$ 10,860
Derivative instruments
Unrealized losses on derivative instruments	(1,213)	(3,844)	(4,266)	(9,015)
Reclassification adjustment for losses included in termination of derivative instruments	10,143		10,143
Reclassification adjustment for losses included in net income	1,810	2,631	6,026	8,815
Net gain (loss) recognized in other comprehensive income	10,740	(1,213)	11,903	(200)
Tax benefit (expense) related to items of other comprehensive income (loss)	(3,952)	444	(4,377)	73
Other comprehensive income (loss)	6,788	(769)	7,526	(127)
Total comprehensive income (loss)	$ (406)	$ 1,547	$ 6,850	$ 10,733