Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 3,904,295	$ 3,394,764	$ 3,657,958	$ 3,191,860
Other comprehensive (loss) income	11,453	(13,940)	(710)	(7,512)
Ending Balance	4,107,617	3,501,600	4,107,617	3,501,600
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(57,307)	(42,484)	(45,144)	(48,912)
Ending Balance	(45,854)	$ (56,424)	(45,854)	$ (56,424)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(52,924)
Other comprehensive (loss) income			(7,292)
Ending Balance	(60,216)		(60,216)
Net Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			7,780
Other comprehensive (loss) income			6,582
Ending Balance	$ 14,362		$ 14,362