Marketable Investment Securities - Schedule of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 379,842	$ 880,815
Equity securities	163,477	142,943
Total marketable investment securities, including restricted amounts	543,319	1,023,758
Less: Restricted marketable investment securities	(13,465)	(13,262)
Marketable investment securities	529,854	1,010,496
Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	167,917	289,784
Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	153,023	498,358
Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 58,902	$ 92,673

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