CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Foreign currency translation adjustments, deferred income taxes	$ 5,322	$ (8,649)	$ 4,862	$ (1,094)
Net gain (loss) on cash flow hedging instruments, deferred income taxes	(458)	146	210	915
Pension liability adjustments, deferred income taxes	(2,057)	2,109	(2,130)	(2,439)
Unrealized gain on marketable securities, deferred income taxes	$ (1)	$ (8)	$ (3)	$ (13)