Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 44,287	$ (51,638)	$ 53,779	$ (6,068)
Effective tax rates	10.00%	(370.00%)	7.00%	(3.00%)
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 56,100		$ 56,100		$ 42,900
Reduction in provision for income taxes due to impact of effective tax rate	52,300		52,300
Deferred tax assets classified as other non-current assets	509,900		509,900		478,300
Deferred tax assets, valuation allowance	103,400		103,400		$ 49,400
Other Noncurrent Liabilities
Income Tax Contingency [Line Items]
Increase in unrecognized tax benefits is reasonably possible	28,500		28,500
Other Noncurrent Assets
Income Tax Contingency [Line Items]
Unrecognized tax benefits	27,600		27,600
Accounting Standards Update 2016-09
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, share-based compensation, excess tax benefit	$ 56,700	$ 32,800	$ 117,400	$ 68,800