Marketable Investment Securities - Schedule of Marketable Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt securities:
Debt securities	$ 471,125	$ 904,022
Fair value option - corporate bonds	12,038	9,128
Total debt securities	483,163	913,150
Equity securities	27,548	35,566
Total marketable investment securities, including restricted amounts	510,711	948,716
Less: Restricted marketable investment securities	(731)	(8,093)
Total marketable investment securities	509,980	940,623
Corporate bonds
Debt securities:
Debt securities	381,201	568,442
Other debt securities
Debt securities:
Debt securities	$ 89,924	$ 335,580

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