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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 6,909	$ (17,668)	$ 4,257	$ (50,108)
Net discrete tax (expense) benefit	2,300	3,200	(2,200)	2,700
Reasonably possible changes to unrecognized tax benefits related to settlement of tax audits and/or expiration of statutes of limitations within the next twelve months	25,000		25,000
Income Tax Contingency [Line Items]
Cumulative effect recognized on initial application of the new guidance	$ 1,608,025	$ 3,114,931	$ 1,608,025	$ 3,114,931		$ 2,179,358
Accounting Standards Update 2016-16
Income Tax Contingency [Line Items]
Cumulative effect recognized on initial application of the new guidance					$ 9,000

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