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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted and restricted cash equivalents and investments	$ 3,073,433	$ 3,214,049
Fair Value Measurements on a Recurring Basis
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	1,863,288	1,433,781
Total restricted cash equivalents and investments	889,830	1,059,969
Total unrestricted and restricted cash equivalents and investments	2,753,118	2,493,750
Fair Value Measurements on a Recurring Basis | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	20,654	22,250
Total restricted cash equivalents and investments	11,868	20,161
Total unrestricted and restricted cash equivalents and investments	32,522	42,411
Fair Value Measurements on a Recurring Basis | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	1,842,634	1,411,531
Total restricted cash equivalents and investments	877,962	1,039,808
Total unrestricted and restricted cash equivalents and investments	2,720,596	2,451,339
Fair Value Measurements on a Recurring Basis | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Total unrestricted and restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Money market funds
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	10,824	22,250
Total restricted cash equivalents and investments	11,868	20,161
Fair Value Measurements on a Recurring Basis | Money market funds | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	10,824	22,250
Total restricted cash equivalents and investments	11,868	20,161
Fair Value Measurements on a Recurring Basis | Money market funds | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Money market funds | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Certificates of deposit
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	480,128	505,438
Total restricted cash equivalents and investments	281,080	421,144
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	480,128	505,438
Total restricted cash equivalents and investments	281,080	421,144
Fair Value Measurements on a Recurring Basis | Certificates of deposit | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Commercial paper
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	1,194,329	806,388
Total restricted cash equivalents and investments	485,042	523,489
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	1,194,329	806,388
Total restricted cash equivalents and investments	485,042	523,489
Fair Value Measurements on a Recurring Basis | Commercial paper | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Corporate bonds
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	165,082	99,705
Total restricted cash equivalents and investments	65,742	63,458
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	165,082	99,705
Total restricted cash equivalents and investments	65,742	63,458
Fair Value Measurements on a Recurring Basis | Corporate bonds | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | Marketable equity securities
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	9,830
Fair Value Measurements on a Recurring Basis | Marketable equity securities | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	9,830
Fair Value Measurements on a Recurring Basis | Marketable equity securities | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0
Fair Value Measurements on a Recurring Basis | Marketable equity securities | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0
Fair Value Measurements on a Recurring Basis | U.S. government securities
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	3,095
Total restricted cash equivalents and investments	46,098	31,717
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 1
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0
Total restricted cash equivalents and investments	0	0
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 2
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	3,095
Total restricted cash equivalents and investments	46,098	31,717
Fair Value Measurements on a Recurring Basis | U.S. government securities | Level 3
Financial Instruments Measured at Fair Value on a Recurring Basis
Total unrestricted cash equivalents and short-term investments	0
Total restricted cash equivalents and investments	$ 0	$ 0

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