CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net gain (loss) on cash flow hedging instruments, deferred income taxes	$ 146	$ 242	$ 915	$ (653)
Pension liability adjustments, deferred income taxes	2,109	1,514	(2,439)	189
Unrealized gain on marketable securities, deferred income taxes	$ (8)	$ (1)	$ (13)	$ (2)