Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Equity adjustment for pension liability, tax expense (benefit)	$ (127)	$ (2,503)	$ 29
Reclassification adjustment for cash flow hedge mark-to-market adjustment, tax expense			$ 244