Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 602,753	$ 268,631
Changes in other comprehensive income:
Unrealized holding (losses) gains on marketable securities, net	(764)	596
Unrealized gains (losses) on foreign currency forward contracts, net of tax of $(5.0) million and $1.5 million, respectively	18,782	(222)
Foreign currency translation adjustment	(2,662)	4,967
Total changes in other comprehensive income	15,356	5,341
Comprehensive income	$ 618,109	$ 273,972

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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