Marketable Investment Securities - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair value of marketable securities
Cash equivalents (including restricted)	$ 787,862	$ 430,995
Available-for-sale debt securities:
Total available-for-sale debt securities	461,694	880,815
Equity securities	186,226	142,943
Total marketable investment securities, including restricted amounts	647,920	1,023,758
Less: Restricted marketable investment securities	(13,327)	(13,262)
Marketable investment securities	634,593	1,010,496
Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	194,074	289,784
Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	221,670	498,358
Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	45,950	92,673
Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	20,995	7,872
Available-for-sale debt securities:
Total available-for-sale debt securities	14,148	14,274
Equity securities	175,404	131,413
Total marketable investment securities, including restricted amounts	189,552	145,687
Less: Restricted marketable investment securities	(13,327)	(13,262)
Marketable investment securities	176,225	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	14,148	14,274
Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	766,867	423,123
Available-for-sale debt securities:
Total available-for-sale debt securities	447,546	866,541
Equity securities	10,822	11,530
Total marketable investment securities, including restricted amounts	458,368	878,071
Less: Restricted marketable investment securities	0	0
Marketable investment securities	458,368	878,071
Level 2 \| Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	194,074	289,784
Level 2 \| Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	221,670	498,358
Level 2 \| Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 31,802	$ 78,399

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

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Amount 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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