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Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost $ 1,259,704 $ 1,396,358
Unrestricted cash equivalents and short-term investments, Unrealized Gains 560 1,621
Unrestricted cash equivalents and short-term investments, Unrealized Losses (664) (8)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 1,259,600 1,397,971
Restricted cash equivalents and investments, Cost or Amortized Cost 1,995,773 1,932,159
Restricted cash equivalents and investments, Unrealized Gains 124 939
Restricted cash equivalents and investments, Unrealized Losses (633) 0
Restricted cash equivalents and investments, Estimated Fair Value 1,995,264 1,933,098
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 3,255,477 3,328,517
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 684 2,560
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (1,297) (8)
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value 3,254,864 3,331,069
Cash 461,300 439,200
Cash and cash equivalents and short-term investments 1,700,000 1,800,000
Restricted cash 3,000 3,000
Restricted cash and cash equivalents and restricted investments 2,000,000 1,900,000
Money market funds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 165,585 276,077
Unrestricted cash equivalents and short-term investments, Unrealized Gains 0 0
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 165,585 276,077
Restricted cash equivalents and investments, Cost or Amortized Cost 29,594 47,264
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 29,594 47,264
Money market deposit accounts    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 363,337 360,127
Unrestricted cash equivalents and short-term investments, Unrealized Gains 0 0
Unrestricted cash equivalents and short-term investments, Unrealized Losses 0 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 363,337 360,127
Certificates of deposit    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 160,010 143,325
Unrestricted cash equivalents and short-term investments, Unrealized Gains 56 146
Unrestricted cash equivalents and short-term investments, Unrealized Losses (43) 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 160,023 143,471
Restricted cash equivalents and investments, Cost or Amortized Cost 53,959 104,310
Restricted cash equivalents and investments, Unrealized Gains 10 60
Restricted cash equivalents and investments, Unrealized Losses 0 0
Restricted cash equivalents and investments, Estimated Fair Value 53,969 104,370
Commercial paper    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 176,947 216,420
Unrestricted cash equivalents and short-term investments, Unrealized Gains 8 105
Unrestricted cash equivalents and short-term investments, Unrealized Losses (214) 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 176,741 216,525
Restricted cash equivalents and investments, Cost or Amortized Cost 1,064,383 921,902
Restricted cash equivalents and investments, Unrealized Gains 42 462
Restricted cash equivalents and investments, Unrealized Losses (385) 0
Restricted cash equivalents and investments, Estimated Fair Value 1,064,040 922,364
Corporate bonds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 316,353 266,199
Unrestricted cash equivalents and short-term investments, Unrealized Gains 472 1,300
Unrestricted cash equivalents and short-term investments, Unrealized Losses (406) (8)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 316,419 267,491
Restricted cash equivalents and investments, Cost or Amortized Cost   15,022
Restricted cash equivalents and investments, Unrealized Gains   15
Restricted cash equivalents and investments, Unrealized Losses   0
Restricted cash equivalents and investments, Estimated Fair Value   15,037
U.S. government and agency securities    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 77,472 134,210
Unrestricted cash equivalents and short-term investments, Unrealized Gains 24 70
Unrestricted cash equivalents and short-term investments, Unrealized Losses (1) 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 77,495 134,280
Restricted cash equivalents and investments, Cost or Amortized Cost 847,837 843,661
Restricted cash equivalents and investments, Unrealized Gains 72 402
Restricted cash equivalents and investments, Unrealized Losses (248) 0
Restricted cash equivalents and investments, Estimated Fair Value $ 847,661 $ 844,063