Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 3,672,218	$ 3,283,217	$ 3,657,958	$ 3,191,860
Other comprehensive (loss) income	21,688	4,495	(12,163)	6,428
Ending Balance	3,904,295	3,394,764	3,904,295	3,394,764
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(78,995)	(46,979)	(45,144)	(48,912)
Ending Balance	(57,307)	$ (42,484)	(57,307)	$ (42,484)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			(52,924)
Other comprehensive (loss) income			(20,469)
Ending Balance	(73,393)		(73,393)
Net Unrealized Gains on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance			7,780
Other comprehensive (loss) income			8,306
Ending Balance	$ 16,086		$ 16,086