Marketable Investment Securities - Schedule of Marketable Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt securities:
Debt securities	$ 750,218	$ 904,022
Fair value option - corporate bonds	12,181	9,128
Total debt securities	762,399	913,150
Equity securities	29,673	35,566
Total marketable investment securities, including restricted amounts	792,072	948,716
Less: Restricted marketable investment securities	(1,711)	(8,093)
Total marketable investment securities	790,361	940,623
Corporate bonds
Debt securities:
Debt securities	446,515	568,442
Other debt securities
Debt securities:
Debt securities	$ 303,703	$ 335,580

Debt Securities, Available-for-sale, Fair Value Option

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