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Cash Equivalents and Investments - Schedule of Cash Equivalents and Short-Term Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost $ 1,267,793 $ 1,396,358
Unrestricted cash equivalents and short-term investments, Unrealized Gains 286 1,621
Unrestricted cash equivalents and short-term investments, Unrealized Losses (987) (8)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 1,267,092 1,397,971
Restricted cash equivalents and investments, Cost or Amortized Cost 2,062,408 1,932,159
Restricted cash equivalents and investments, Unrealized Gains 25 939
Restricted cash equivalents and investments, Unrealized Losses (826) 0
Restricted cash equivalents and investments, Estimated Fair Value 2,061,607 1,933,098
Unrestricted and restricted cash equivalents and investments, Cost or Amortized Cost 3,330,201 3,328,517
Unrestricted and restricted cash equivalents and investments, Unrealized Gains 311 2,560
Unrestricted and restricted cash equivalents and investments, Unrealized Losses (1,813) (8)
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value 3,328,699 3,331,069
Cash 527,400 439,200
Cash and cash equivalents and short-term investments 1,800,000 1,800,000
Restricted cash 3,100 3,000
Restricted cash and cash equivalents and restricted investments 2,100,000 1,900,000
Money market funds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 201,464 276,077
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 201,464 276,077
Restricted cash equivalents and investments, Cost or Amortized Cost 35,314 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 35,314 47,264
Money market deposit accounts    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 362,776 360,127
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 362,776 360,127
Certificates of deposit    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 159,015 143,325
Unrestricted cash equivalents and short-term investments, Unrealized Gains 24 146
Unrestricted cash equivalents and short-term investments, Unrealized Losses (75) 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 158,964 143,471
Restricted cash equivalents and investments, Cost or Amortized Cost 13,307 104,310
Restricted cash equivalents and investments, Unrealized Gains 2 60
Restricted cash equivalents and investments, Unrealized Losses 0 0
Restricted cash equivalents and investments, Estimated Fair Value 13,309 104,370
Commercial paper    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 166,156 216,420
Unrestricted cash equivalents and short-term investments, Unrealized Gains 8 105
Unrestricted cash equivalents and short-term investments, Unrealized Losses (163) 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 166,001 216,525
Restricted cash equivalents and investments, Cost or Amortized Cost 1,243,537 921,902
Restricted cash equivalents and investments, Unrealized Gains 21 462
Restricted cash equivalents and investments, Unrealized Losses (247) 0
Restricted cash equivalents and investments, Estimated Fair Value 1,243,311 922,364
Corporate bonds    
Cash and Cash Equivalents [Line Items]    
Unrestricted cash equivalents and short-term investments, Cost or Amortized Cost 319,577 266,199
Unrestricted cash equivalents and short-term investments, Unrealized Gains 254 1,300
Unrestricted cash equivalents and short-term investments, Unrealized Losses (703) (8)
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 319,128 267,491
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 58,805 134,210
Unrestricted cash equivalents and short-term investments, Unrealized Gains 0 70
Unrestricted cash equivalents and short-term investments, Unrealized Losses (46) 0
Unrestricted cash equivalents and short-term investments, Estimated Fair Value 58,759 134,280
Restricted cash equivalents and investments, Cost or Amortized Cost 770,250 843,661
Restricted cash equivalents and investments, Unrealized Gains 2 402
Restricted cash equivalents and investments, Unrealized Losses (579) 0
Restricted cash equivalents and investments, Estimated Fair Value $ 769,673 $ 844,063