Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Current Federal Tax Expense (Benefit)	$ (12,345)	$ 119,298	$ 45,371
Current State and Local Tax Expense (Benefit)	20,141	(6,156)	7,022
Current International Tax Expense (Benefit)	178,767	134,987	109,598
Current Income Tax Expense (Benefit)	186,563	248,129	161,991
Deferred Federal Income Tax Expense (Benefit)	19,207	31,167	29,973
Deferred State and Local Income Tax Expense (Benefit)	312	13,535	7,161
Deferred International Income Tax Expense (Benefit)	(18,283)	(6,290)	(8,394)
Deferred income taxes	1,236	38,412	28,740
Provision for income taxes	$ 187,799	$ 286,541	$ 190,731