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)	$ 9,035	$ 23,163	$ (23,047)
Other comprehensive income (loss):
Gain on derivatives		6,344	18,267
Adjustment to pension liability	(13,793)	(4,171)	6,558
Other comprehensive (loss) income before income taxes	(13,793)	2,173	24,825
Income tax (benefit) expense	(5,379)	847	9,681
Other comprehensive (loss) income	(8,414)	1,326	15,144
Comprehensive income (loss)	$ 621	$ 24,489	$ (7,903)