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
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 6,461,654	$ 4,723,313	$ 6,085,244	$ 4,435,203
Other comprehensive (loss) income before reclassifications			(171)	7,931
Amounts reclassified from accumulated other comprehensive income (loss)			(11,977)	(11,791)
Total other comprehensive loss	(27,504)	(9,201)	(12,148)	(3,860)
Ending balance	7,519,242	5,069,965	7,519,242	5,069,965
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(895)	(11,227)
Other comprehensive (loss) income before reclassifications			(13,200)	1,091
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Total other comprehensive loss			(13,200)	1,091
Ending balance	(14,095)	(10,136)	(14,095)	(10,136)
On Available-For-Sale Debt Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			503	(536)
Other comprehensive (loss) income before reclassifications			1,950	1,047
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Total other comprehensive loss			1,950	1,047
Ending balance	2,453	511	2,453	511
On Foreign Currency Forward Contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(1,581)	12,422
Other comprehensive (loss) income before reclassifications			11,079	5,793
Amounts reclassified from accumulated other comprehensive income (loss)			(11,977)	(11,791)
Total other comprehensive loss			(898)	(5,998)
Ending balance	(2,479)	6,424	(2,479)	6,424
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	13,383	6,000	(1,973)	659
Total other comprehensive loss	(27,504)	(9,201)	(12,148)	(3,860)
Ending balance	$ (14,121)	$ (3,201)	$ (14,121)	$ (3,201)