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Debt Debt (Schedule of Unsecured Term Loans) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Private placement notes - unsecured    
Debt Instrument [Line Items]    
Amount $ 225,000 $ 400,000
September 2024    
Debt Instrument [Line Items]    
Amount $ 75,000  
Fixed Rate 3.93%  
November 2025    
Debt Instrument [Line Items]    
Amount $ 50,000  
Fixed Rate 4.33%  
January 2027    
Debt Instrument [Line Items]    
Amount $ 100,000  
Fixed Rate 4.51%