CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 44,064	$ 90,014	$ 108,019	$ 162,934
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	75,972	(27,640)	(112,932)	(28,675)
Net (loss) gain on derivative financial instruments	(16,824)	440	7,928	2,197
Net unrealized holding gain (loss) on available-for-sale securities	39,416	(1,762)	70,267	(3,803)
Pension liability adjustments	(8)	823	1,409	1,141
Total other comprehensive income (loss), net of tax	98,556	(28,139)	(33,328)	(29,140)
Total comprehensive income	142,620	61,875	74,691	133,794
Less: Comprehensive income attributable to noncontrolling interests	(40)	(254)	500	(140)
Net (decrease) increase in other comprehensive income	$ 142,660	$ 62,129	$ 74,191	$ 133,934