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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Mar. 08, 2017
Debt Instrument [Line Items]      
Total principal amount $ 375,000 $ 375,000  
Unamortized discount and debt issuance costs 2,069 2,468  
Total 372,931 372,532  
Unsecured Debt | Unsecured Notes One      
Debt Instrument [Line Items]      
Interest rate, stated percentage     4.40%
Notes payable | Unsecured Debt      
Debt Instrument [Line Items]      
Total 372,931 372,532  
Notes payable | Unsecured Debt | Unsecured Notes One      
Debt Instrument [Line Items]      
Unsecured debt $ 375,000 375,000 $ 375,000
Interest rate, stated percentage 4.40%    
Notes payable | Unsecured Debt | Unsecured Notes Two      
Debt Instrument [Line Items]      
Unsecured debt $ 0 $ 0  
Notes payable | Unsecured Debt | Unsecured Notes Two | Minimum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.125%    
Notes payable | Unsecured Debt | Unsecured Notes Two | Maximum | LIBOR      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.50%