Marketable Investment Securities - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair value of marketable securities
Cash equivalents (including restricted)	$ 825,111	$ 430,995
Available-for-sale debt securities:
Total available-for-sale debt securities	529,445	880,815
Equity securities	147,870	142,943
Total marketable investment securities, including restricted amounts	677,315	1,023,758
Less: Restricted marketable investment securities	(10,411)	(13,262)
Marketable investment securities	666,904	1,010,496
Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	227,482	289,784
Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	289,046	498,358
Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	12,917	92,673
Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	5,580	7,872
Available-for-sale debt securities:
Total available-for-sale debt securities	10,411	14,274
Equity securities	139,000	131,413
Total marketable investment securities, including restricted amounts	149,411	145,687
Less: Restricted marketable investment securities	(10,411)	(13,262)
Marketable investment securities	139,000	132,425
Level 1 \| Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Level 1 \| Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Level 1 \| Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	10,411	14,274
Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	819,531	423,123
Available-for-sale debt securities:
Total available-for-sale debt securities	519,034	866,541
Equity securities	8,870	11,530
Total marketable investment securities, including restricted amounts	527,904	878,071
Less: Restricted marketable investment securities	0	0
Marketable investment securities	527,904	878,071
Level 2 \| Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	227,482	289,784
Level 2 \| Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	289,046	498,358
Level 2 \| Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 2,506	$ 78,399

Cash And Cash Equivalents And Restricted Cash And Cash Equivalents, Fair Value Disclosure

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in marketable security.

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