Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
AOCI, Net of Tax [Roll Forward]
Balance	$ 6,085,244	$ 4,435,203	$ 2,042,306
Other comprehensive income before reclassifications	(69,419)	22,884	34,577
Amounts reclassified from accumulated other comprehensive income (loss)	2,912	(25,516)	1,774
Total other comprehensive (loss) income	(66,507)	(2,632)	36,351
Balance	8,686,815	6,085,244	4,435,203
Cumulative Effect, Period of Adoption, Adjustment
AOCI, Net of Tax [Roll Forward]
Balance		(40,310)	9,229
Balance			(40,310)
Foreign Currency Translation Adjustment
AOCI, Net of Tax [Roll Forward]
Balance	(895)	(11,227)	(21,031)
Other comprehensive income before reclassifications	(14,783)	10,332	8,855
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Total other comprehensive (loss) income	(14,783)	10,332	8,855
Balance	(15,678)	(895)	(11,227)
Foreign Currency Translation Adjustment | Cumulative Effect, Period of Adoption, Adjustment
AOCI, Net of Tax [Roll Forward]
Balance		949
Balance			949
On Available-For-Sale Debt Securities
AOCI, Net of Tax [Roll Forward]
Balance	503	(536)	(594)
Other comprehensive income before reclassifications	(169)	1,039	58
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Total other comprehensive (loss) income	(169)	1,039	58
Balance	334	503	(536)
On Available-For-Sale Debt Securities | Cumulative Effect, Period of Adoption, Adjustment
AOCI, Net of Tax [Roll Forward]
Balance		0
Balance			0
On Equity Securities
AOCI, Net of Tax [Roll Forward]
Balance	0	0	25,069
Other comprehensive income before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Total other comprehensive (loss) income	0	0	0
Balance	0	0	0
On Equity Securities | Cumulative Effect, Period of Adoption, Adjustment
AOCI, Net of Tax [Roll Forward]
Balance		(25,069)
Balance			(25,069)
On Foreign Currency Forward Contracts
AOCI, Net of Tax [Roll Forward]
Balance	(1,581)	12,422	(15,016)
Other comprehensive income before reclassifications	(54,467)	11,513	25,664
Amounts reclassified from accumulated other comprehensive income (loss)	2,912	(25,516)	1,774
Total other comprehensive (loss) income	(51,555)	(14,003)	27,438
Balance	(53,136)	(1,581)	12,422
On Foreign Currency Forward Contracts | Cumulative Effect, Period of Adoption, Adjustment
AOCI, Net of Tax [Roll Forward]
Balance		0
Balance			0
Total
AOCI, Net of Tax [Roll Forward]
Balance	(1,973)	659	(11,572)
Total other comprehensive (loss) income	(66,507)	(2,632)	36,351
Balance	$ (68,480)	(1,973)	659
Total | Cumulative Effect, Period of Adoption, Adjustment
AOCI, Net of Tax [Roll Forward]
Balance		$ (24,120)	(24,120)
Balance			$ (24,120)