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
Net gains (losses) on cash flow hedging instruments, deferred income taxes	$ 567	$ (2,126)	$ 355
Reclassification adjustment for (gain) loss on cash flow hedging instruments, deferred income taxes	0	25	(8)
Pension liability adjustments, deferred income taxes	7,572	19,143	(9,727)
Unrealized gain (loss) on marketable securities, deferred income taxes	(3)	7	(8)
Reclassification adjustment for gain on marketable securities, deferred income taxes			$ 1