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Fair Value Measurements (Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assets:    
Cash and cash equivalents maturity period (maximum) 3 months  
Fair Value, Measurements, Recurring    
Assets:    
Cash and cash equivalents $ 455,084 $ 380,564
Restricted cash 9,104 14,116
Restricted investments 139,986 130,287
Investments in lieu of retainage 145,124 106,949
Total 749,298 631,916
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Cash and cash equivalents 455,084 380,564
Restricted cash 9,104 14,116
Restricted investments 0 0
Investments in lieu of retainage 38,359 19,988
Total 502,547 414,668
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Restricted investments 139,986 130,287
Investments in lieu of retainage 106,765 86,961
Total 246,751 217,248
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Cash and cash equivalents 0 0
Restricted cash 0 0
Restricted investments 0 0
Investments in lieu of retainage 0 0
Total 0 0
Money Market Funds | Fair Value, Measurements, Recurring | Level 1    
Assets:    
Investments in lieu of retainage 38,400 20,000
Debt Securities | Fair Value, Measurements, Recurring | Level 2    
Assets:    
Investments in lieu of retainage $ 106,800 $ 87,000