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Long-term Debt (Details) - USD ($)
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Borrowings    
Letters of credit outstanding $ 15,900,000 $ 15,800,000
Revolving credit facility    
Borrowings    
Borrowings from revolving credit facility 0  
Repayments of revolving credit facility 0  
Revolving credit facility 0 0
Availability under revolving line of credit 1,000,000,000 $ 1,000,000,000
Letter of credit | Revolving credit facility    
Borrowings    
Availability under revolving line of credit 94,100,000  
Maximum borrowing capacity $ 110,000,000