Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 55,939	$ 59,688
Other comprehensive loss:
Change in foreign currency translation adjustment	(721)	(6,813)
Available for sale securities:
Change in net unrealized gains	160	(378)
Less: reclassification adjustment for net gains included in net income	(163)	(85)
Net change (net of tax effect)	(3)	(463)
Loss on pension liability	0	(334)
Cash flow hedges:
Change in unrealized gains	1,320	(3,449)
Less: reclassification adjustment for net (gains) losses included in net income	(1,297)	524
Net change (net of tax effect)	23	(2,925)
Other comprehensive loss	(701)	(10,535)
Comprehensive income	$ 55,238	$ 49,153