Marketable Investment Securities - Schedule of Marketable Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt securities:
Debt securities	$ 1,906,945	$ 904,022
Fair value option - corporate bonds	26,355	9,128
Total debt securities	1,933,300	913,150
Equity securities	18,349	35,566
Total marketable investment securities, including restricted amounts	1,951,649	948,716
Less: Restricted marketable investment securities	(845)	(8,093)
Total marketable investment securities	1,950,804	940,623
Corporate bonds
Debt securities:
Debt securities	305,775	568,442
Commercial paper
Debt securities:
Debt securities	1,330,726	321,706
Other debt securities
Debt securities:
Debt securities	$ 270,444	$ 13,874

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