CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Foreign currency translation adjustments, deferred income taxes	$ (359)	$ (1,500)	$ (460)	$ 7,555
Net gain (loss) on cash flow hedging instruments, deferred income taxes	282	1,206	668	769
Pension liability adjustments, deferred income taxes	333	(457)	(73)	(4,548)
Unrealized gain on marketable securities, deferred income taxes	$ (5)	$ 0	$ (2)	$ (5)