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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Assets:    
Cash and cash equivalents maturity period (maximum) 3 months  
Fair value measured on a recurring basis    
Assets:    
Cash and cash equivalents $ 276,489 $ 455,084
Restricted cash 40,296 9,104
Restricted investments 135,592 139,986
Investments in lieu of retention 154,764 145,124
Total 607,141 749,298
Fair value measured on a recurring basis | Level 1    
Assets:    
Cash and cash equivalents 276,489 455,084
Restricted cash 40,296 9,104
Restricted investments 0 0
Investments in lieu of retention 62,171 38,359
Total 378,956 502,547
Fair value measured on a recurring basis | Level 1 | Money Market Funds    
Assets:    
Investments in lieu of retention 62,200 38,400
Fair value measured on a recurring basis | Level 2    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Restricted investments 135,592 139,986
Investments in lieu of retention 92,593 106,765
Total 228,185 246,751
Fair value measured on a recurring basis | Level 2 | Debt Securities    
Assets:    
Investments in lieu of retention 92,600 106,800
Fair value measured on a recurring basis | Level 3    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Restricted investments 0 0
Investments in lieu of retention 0 0
Total $ 0 $ 0