Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Provision for Income Taxes	$ 20,402	$ 17,539	$ 60,253	$ 48,018
Effective Income Tax Rate Reconciliation, Percent	28.00%	23.00%	21.00%	16.00%
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount			$ 12,176	$ 22,830
Effective Income Tax Rate Reconciliation, ASU 2016-09 Benefit for Stock Compensation, Percent			4.00%	8.00%
Increase (Decrease) In Deferred Tax Assets Associated With Changes In Unrealized Gain Loss On Marketable Securities In Accumulated Other Comprehensive Income Loss			$ 219	$ 133
Increase (Decrease) In Deferred Tax Assets Associated With Changes In Foreign Currency Translation Adjustment Gain Loss In Accumulated Other Comprehensive Income Loss			1,333	$ 73
Unrecognized Tax Benefits	$ 494		494
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	402		402
Interest on Income Taxes Accrued, Unrecognized Tax Benefits	18		202
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 1		$ 12