CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net gains (losses) on cash flow hedging instruments, deferred income taxes	$ (1,410)	$ 567	$ (2,126)
Reclassification adjustment for (gain) loss on cash flow hedging instruments, deferred income taxes	0	0	25
Pension liability adjustments, deferred income taxes	(11,095)	7,572	19,143
Unrealized gain (loss) on marketable securities, deferred income taxes	$ (18)	$ (3)	$ 7