CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net gains (losses) on cash flow hedging instruments, deferred income taxes	$ (2,126)	$ 355	$ 10,490
Reclassification adjustment for (gain) loss on cash flow hedging instruments, deferred income taxes	25	(8)	359
Pension liability adjustments, deferred income taxes	19,143	(9,727)	26,012
Unrealized gain (loss) on marketable securities, deferred income taxes	7	(8)	(2)
Reclassification adjustment for gain on marketable securities, deferred income taxes		$ 1