Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 80,017	$ 41,626	$ (20,573)
Changes in fair value of interest rate swap, net of tax			452
Settlement of interest rate swap, net of tax		858
Foreign currency translation	(7,792)	(912)	6,887
Comprehensive income (loss)	$ 72,225	$ 41,572	$ (13,234)