Income Taxes - Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Effective income tax reconciliation table [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate		21.00%
United States		$ 186,677	$ 115,664	$ 235,317
International		722,696	578,253	480,202
Income before income taxes		909,373	693,917	715,519
Provision at statutory tax rate		190,968	242,415	250,446
State taxes, net of federal benefit		18,888	5,184	9,219
International effective tax rate differential		7,480	(88,444)	(64,002)
Capital loss	[1]	60,757	0	0
Change in valuation allowance		(66,557)	1,408	7,174
Other non-deductible expenses		14,128	12,700	3,516
Changes in tax accruals		(3,968)	(7,973)	(3,679)
Tax Credits		(7,884)	(8,170)	(14,510)
Tax Act's transition tax	[1]	(28,323)	196,010	0
Tax Act's impact on deferred taxes	[2]	0	(71,261)	0
Other		2,310	4,672	2,567
Provision for income taxes		$ 187,799	$ 286,541	$ 190,731

[1] For the year ended December 31, 2017, the company accrued a provisional estimate of $196,010 of tax expense for the Tax Act’s one-time transition tax on the foreign subsidiaries’ accumulated, unremitted earnings in accordance with U.S. Securities and Exchange Commission’s Staff Accounting Bulletin (“SAB 118”). Additionally, during the fourth quarter of 2018 the company recorded a $28,323 benefit upon finalizing its analysis of the impact from the Tax Act.

[2] For the year ended December 31, 2017, the company accrued $71,261 in provisional tax benefit related to the net change in deferred tax liabilities stemming from the Tax Act’s reduction of the U.S. federal tax rate from 35% to 21%, and disallowance of certain incentive based compensation tax deductibility under Internal Revenue Code Section 162(m).