Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
United States	$ 235,256	$ 281,579	$ 317,400
International	480,141	410,604	365,933
Income before income taxes	715,397	692,183	683,333
Provision at statutory tax rate	250,389	242,264	239,166
State taxes, net of federal benefit	9,219	10,526	11,734
International effective tax rate differential	(64,002)	(56,132)	(56,865)
Change in valuation allowance	7,174	(205)	(7,803)
Other non-deductible expenses	3,516	3,530	4,040
Changes in tax accruals	(3,679)	(7,423)	1,335
Tax Credits	(14,510)	0	0
Other	2,567	(863)	(6,664)
Provision for income taxes	$ 190,674	$ 191,697	$ 184,943