Accumulated Other Comprehensive Loss (AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' Equity beginning balance	$ 3,711,616	$ 3,340,180
Total other comprehensive loss	(619,659)	(20,334)
Stockholders' Equity ending balance	2,796,229	3,530,967
Cumulative Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' Equity beginning balance	(929,713)	(913,858)
Other comprehensive income/(loss) before reclassifications	(575,118)	373
Amounts reclassified from AOCI	0	0
Tax effect	0	0
Total other comprehensive loss	(575,118)	373
Stockholders' Equity ending balance	(1,504,831)	(913,485)
Unrealized Gains/Losses on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' Equity beginning balance	(42,752)	0
Other comprehensive income/(loss) before reclassifications	(63,351)	(27,761)
Amounts reclassified from AOCI	4,414	191
Tax effect	14,396	6,863
Total other comprehensive loss	(44,541)	(20,707)
Stockholders' Equity ending balance	(87,293)	(20,707)
Unrealized Gains/Losses on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' Equity beginning balance	(972,465)	(913,858)
Other comprehensive income/(loss) before reclassifications	(638,469)	(27,388)
Amounts reclassified from AOCI	4,414	191
Tax effect	14,396	6,863
Total other comprehensive loss	(619,659)	(20,334)
Stockholders' Equity ending balance	$ (1,592,124)	$ (934,192)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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