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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Provision for (benefit from) income taxes	$ 347,079	$ (24,025)	$ 632,952	$ 29,754
Effective tax rates	34.00%	(6.00%)	33.00%	3.00%
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation, share-based compensation, excess tax benefit	$ 27,000	$ 40,000	$ 114,000	$ 158,000
Unrecognized tax benefits	68,000		68,000		$ 48,000
Reduction in provision for income taxes due to impact of effective tax rate	63,000		63,000
Deferred tax assets classified as other non-current assets	470,000		470,000		564,000
Deferred tax assets, valuation allowance	133,000		133,000		$ 125,000
Other noncurrent liabilities
Income Tax Contingency [Line Items]
Unrecognized tax benefits	18,000		18,000
Non-current Assets
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 50,000		$ 50,000