Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Income tax expense	$ 21,380	$ 2,481
Amount of change in deferred tax assets valuation allowance	14,900
Gross unrecognized tax benefits	25,200		$ 25,300
Foreign Tax Authority
Income Tax Contingency [Line Items]
Potential decrease in unrecognized tax benefits in the next 12 months	$ 14,900