CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Net gain (loss) on cash flow hedging instruments, deferred income taxes	$ 1,206	$ (680)	$ 769	$ (895)
Pension liability adjustments, deferred income taxes	(457)	(2,118)	(4,548)	(1,325)
Unrealized gain (loss) on marketable securities, deferred income taxes	$ 0	$ 3	$ (5)	$ (1)