Consolidated Statements of Comprehensive Income(Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (2,229)	$ (7,194)	$ 9,073	$ (676)
Derivative instruments
Unrealized loss on derivative instruments	(8)	(1,213)	(56)	(4,266)
Reclassification adjustment for losses included in termination of derivative instruments		10,143		10,143
Reclassification adjustment for losses included in net income	390	1,810	1,149	6,026
Net gain recognized in other comprehensive income	382	10,740	1,093	11,903
Tax expense related to items of other comprehensive income	(140)	(3,952)	(401)	(4,377)
Other comprehensive income	242	6,788	692	7,526
Total comprehensive income (loss)	$ (1,987)	$ (406)	$ 9,765	$ 6,850