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Credit Facility (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Feb. 21, 2023
Dec. 31, 2021
Credit Facility        
Schedule Of Debt [Line Items]        
Credit Facility borrowing capacity $ 500,000,000 $ 500,000,000    
Interest rate spread 0.75%      
Facility fee percentage 0.10%      
Outstanding borrowings $ 0 0    
Standby Letters of Credit        
Schedule Of Debt [Line Items]        
Undrawn standby letters of credit $ 18,600,000 $ 18,600,000   $ 21,200,000
Minimum | Credit Facility        
Schedule Of Debt [Line Items]        
Interest rate spread   0.70%    
Facility fee percentage   0.07%    
Maximum | Credit Facility        
Schedule Of Debt [Line Items]        
Interest rate spread   1.35%    
Facility fee percentage   0.25%    
Subsequent Event | Credit Facility        
Schedule Of Debt [Line Items]        
Outstanding borrowings     $ 0