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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted and restricted cash equivalents and investments | $ 3,260,826 | $ 3,284,061
Fair Value Measurements on a Recurring Basis |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and investments | 1,373,721 | 1,342,085
Total restricted cash equivalents and investments | 1,060,558 | 1,159,963
Total unrestricted and restricted cash equivalents and investments | 2,434,279 | 2,502,048
Fair Value Measurements on a Recurring Basis | Level 1 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and investments | 88,630 | 0
Total restricted cash equivalents and investments | 126,649 | 24,757
Total unrestricted and restricted cash equivalents and investments | 215,279 | 24,757
Fair Value Measurements on a Recurring Basis | Level 2 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and investments | 1,285,091 | 1,342,085
Total restricted cash equivalents and investments | 933,909 | 1,135,206
Total unrestricted and restricted cash equivalents and investments | 2,219,000 | 2,477,291
Fair Value Measurements on a Recurring Basis | Level 3 |  |
Financial Instruments Measured at Fair Value on a Recurring Basis |  |
Total unrestricted cash equivalents and 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 investments | 88,630 |
Total restricted cash equivalents and investments | 126,649 | 24,757
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 investments | 88,630 |
Total restricted cash equivalents and investments | 126,649 | 24,757
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 investments | 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 investments | 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 investments | 864,598 | 677,777
Total restricted cash equivalents and investments | 606,331 | 481,365
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 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 investments | 864,598 | 677,777
Total restricted cash equivalents and investments | 606,331 | 481,365
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 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 investments | 312,873 | 376,789
Total restricted cash equivalents and investments | 258,637 | 469,240
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 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 investments | 312,873 | 376,789
Total restricted cash equivalents and investments | 258,637 | 469,240
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 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 investments | 107,620 | 287,519
Total restricted cash equivalents and investments | 68,941 | 184,601
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 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 investments | 107,620 | 287,519
Total restricted cash equivalents and investments | 68,941 | 184,601
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 investments | 0 | 0
Total restricted cash equivalents and investments | $ 0 | $ 0

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