CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Foreign currency translation adjustments, deferred income taxes	$ 4,542	$ (359)	$ 2,892	$ (460)
Net gain (loss) on cash flow hedging instruments, deferred income taxes	984	282	(538)	668
Pension liability adjustments, deferred income taxes	2,131	333	(960)	(73)
Unrealized gain on marketable securities, deferred income taxes	$ (1)	$ (5)	$ 3	$ (2)