Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Provision for Income Taxes	$ 32,030	$ 25,541	$ 39,851	$ 30,479
Effective Income Tax Rate Reconciliation, Percent	25.00%	24.00%	19.00%	14.00%
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount			$ 12,130	$ 22,222
Effective Income Tax Rate Reconciliation, ASU 2016-09 Benefit for Stock Compensation, Percent			6.00%	10.00%
Increase (Decrease) In Deferred Tax Assets Associated With Changes In Unrealized Gain Loss On Marketable Securities In Accumulated Other Comprehensive Income Loss			$ 205	$ 130
Increase (Decrease) In Deferred Tax Assets Associated With Changes In Foreign Currency Translation Adjustment Gain Loss In Accumulated Other Comprehensive Income Loss			262	$ 1,108
Unrecognized Tax Benefits	$ 615		615
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	501		501
Unrecognized Tax Benefits That May Be Recognized Within The Year	122		122
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	184		184
Unrecognized Tax Benefits, Income Tax Penalties Accrued	11		11
Unrecognized Tax Benefits, Interest On Income Taxes Expected To Be Reversed Within The Year	38		38
Unrecognized Tax Benefits, Penalties On Income Taxes Expected To Be Reversed Within The Year	$ 3		$ 3