Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
United States	$ 281,579	$ 317,400	$ 326,990
International	410,604	365,933	255,229
Income before income taxes	692,183	683,333	582,219
Provision at statutory tax rate	242,264	239,166	203,777
State taxes, net of federal benefit	10,526	11,734	11,885
International effective tax rate differential	(56,132)	(56,865)	(22,059)
Change in valuation allowance	(205)	(7,803)	(8,253)
Other non-deductible expenses	3,530	4,040	2,840
Changes in tax accruals	(7,423)	1,335	(1,336)
Other	(863)	(6,664)	(4,511)
Provision for income taxes	$ 191,697	$ 184,943	$ 182,343