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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 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 $ 526,090 $ 455,084
Restricted cash 20,990 9,104
Restricted investments 157,373 139,986
Investments in lieu of retention 164,992 145,124
Total 869,445 749,298
Fair value measured on a recurring basis | Level 1    
Assets:    
Cash and cash equivalents 526,090 455,084
Restricted cash 20,990 9,104
Restricted investments 0 0
Investments in lieu of retention 37,797 38,359
Total 584,877 502,547
Fair value measured on a recurring basis | Level 1 | Money Market Funds    
Assets:    
Investments in lieu of retention 37,800 38,400
Fair value measured on a recurring basis | Level 2    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Restricted investments 157,373 139,986
Investments in lieu of retention 127,195 106,765
Total 284,568 246,751
Fair value measured on a recurring basis | Level 2 | Debt Securities    
Assets:    
Investments in lieu of retention 127,200 106,800
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