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Supplemental Financial Statement Information - Summary of Cash Equivalents and Short-Term Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | $ 2,193,558 | $ 2,117,165
Unrestricted cash equivalents and investments, Unrealized Gains | 256 | 331
Unrestricted cash equivalents and investments, Unrealized Losses | (52) | (65)
Unrestricted cash equivalents and investments, Estimated Fair Value | 2,193,762 | 2,117,431
Restricted cash equivalents and investments, Cost or Amortized Cost | 1,066,913 | 1,166,332
Restricted cash equivalents and investments, Unrealized Gains | 182 | 337
Restricted cash equivalents and investments, Unrealized Losses | (31) | (39)
Restricted cash equivalents and investments, Estimated Fair Value | 1,067,064 | 1,166,630
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost | 3,260,471 | 3,283,497
Unrestricted and restricted cash equivalents and investments, Unrealized Gains | 438 | 668
Unrestricted and restricted cash equivalents and investments, Unrealized Losses | (83) | (104)
Total unrestricted and restricted cash equivalents and investments | 3,260,826 | 3,284,061
Money market deposit accounts |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | 180,041 | 174,347
Unrestricted cash equivalents and investments, Unrealized Gains | 0 | 0
Unrestricted cash equivalents and investments, Unrealized Losses | 0 | 0
Unrestricted cash equivalents and investments, Estimated Fair Value | 180,041 | 174,347
Restricted cash equivalents and investments, Cost or Amortized Cost | 0 | 162
Restricted cash equivalents and investments, Unrealized Gains | 0 | 0
Restricted cash equivalents and investments, Unrealized Losses | 0 | 0
Restricted cash equivalents and investments, Estimated Fair Value | 0 | 162
Money market funds |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | 88,630 |
Unrestricted cash equivalents and investments, Unrealized Gains | 0 |
Unrestricted cash equivalents and investments, Unrealized Losses | 0 |
Unrestricted cash equivalents and investments, Estimated Fair Value | 88,630 |
Restricted cash equivalents and investments, Cost or Amortized Cost | 126,649 | 24,757
Restricted cash equivalents and investments, Unrealized Gains | 0 | 0
Restricted cash equivalents and investments, Unrealized Losses | 0 | 0
Restricted cash equivalents and investments, Estimated Fair Value | 126,649 | 24,757
Term deposits |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | 640,000 | 601,000
Unrestricted cash equivalents and investments, Unrealized Gains | 0 | 0
Unrestricted cash equivalents and investments, Unrealized Losses | 0 | 0
Unrestricted cash equivalents and investments, Estimated Fair Value | 640,000 | 601,000
Restricted cash equivalents and investments, Cost or Amortized Cost | 6,506 | 6,506
Restricted cash equivalents and investments, Unrealized Gains | 0 | 0
Restricted cash equivalents and investments, Unrealized Losses | 0 | 0
Restricted cash equivalents and investments, Estimated Fair Value | 6,506 | 6,506
Certificates of deposit |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | 864,376 | 677,602
Unrestricted cash equivalents and investments, Unrealized Gains | 238 | 178
Unrestricted cash equivalents and investments, Unrealized Losses | (16) | (4)
Unrestricted cash equivalents and investments, Estimated Fair Value | 864,598 | 677,776
Restricted cash equivalents and investments, Cost or Amortized Cost | 606,178 | 481,154
Restricted cash equivalents and investments, Unrealized Gains | 164 | 213
Restricted cash equivalents and investments, Unrealized Losses | (11) | (3)
Restricted cash equivalents and investments, Estimated Fair Value | 606,331 | 481,364
Commercial paper |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | 312,869 | 376,771
Unrestricted cash equivalents and investments, Unrealized Gains | 18 | 38
Unrestricted cash equivalents and investments, Unrealized Losses | (14) | (20)
Unrestricted cash equivalents and investments, Estimated Fair Value | 312,873 | 376,789
Restricted cash equivalents and investments, Cost or Amortized Cost | 258,627 | 469,193
Restricted cash equivalents and investments, Unrealized Gains | 18 | 57
Restricted cash equivalents and investments, Unrealized Losses | (8) | (10)
Restricted cash equivalents and investments, Estimated Fair Value | 258,637 | 469,240
Corporate bonds |  |
Cash Equivalents and Short-Term Investments [Line Items] |  |
Unrestricted cash equivalents and investments, Cost or Amortized Cost | 107,642 | 287,445
Unrestricted cash equivalents and investments, Unrealized Gains | 0 | 115
Unrestricted cash equivalents and investments, Unrealized Losses | (22) | (41)
Unrestricted cash equivalents and investments, Estimated Fair Value | 107,620 | 287,519
Restricted cash equivalents and investments, Cost or Amortized Cost | 68,953 | 184,560
Restricted cash equivalents and investments, Unrealized Gains | 0 | 67
Restricted cash equivalents and investments, Unrealized Losses | (12) | (26)
Restricted cash equivalents and investments, Estimated Fair Value | $ 68,941 | $ 184,601

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