Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 1,805,606	$ 1,708,625	$ 1,739,907	$ 1,738,778
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(4,415)
Amounts reclassified from accumulated other comprehensive loss			670
Total other comprehensive (loss) income, net of tax	(6,021)	6,781	(3,745)	(3,894)
Ending balance	1,838,088	1,729,433	1,838,088	1,729,433
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			(18,349)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(2,867)
Amounts reclassified from accumulated other comprehensive loss			0
Total other comprehensive (loss) income, net of tax			(2,867)
Ending balance	(21,216)		(21,216)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance			1,551
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Other comprehensive loss before reclassifications			(1,548)
Amounts reclassified from accumulated other comprehensive loss			670
Total other comprehensive (loss) income, net of tax			(878)
Ending balance	673		673
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(14,522)	(34,179)	(16,798)	(23,504)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Total other comprehensive (loss) income, net of tax	(6,021)	6,781	(3,745)	(3,894)
Ending balance	$ (20,543)	$ (27,398)	$ (20,543)	$ (27,398)