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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Mar. 08, 2017
Debt Instrument [Line Items]      
Interest rate     4.40%
Total principal amount $ 375,000 $ 375,000  
Less unamortized discount and debt issuance costs 1,870 2,069  
Notes payable 373,130 372,931  
Unsecured debt | Notes payable      
Debt Instrument [Line Items]      
Notes payable $ 373,130 372,931  
Unsecured debt | Notes payable | Level 2 | Unsecured Notes One      
Debt Instrument [Line Items]      
Interest rate 4.40%    
Unsecured debt $ 375,000 375,000 $ 375,000
Unsecured debt | Notes payable | Level 2 | Unsecured Notes Two      
Debt Instrument [Line Items]      
Unsecured debt $ 0 $ 0  
LIBOR | Minimum | Unsecured debt | Notes payable | Level 2 | Unsecured Notes Two      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.125%    
LIBOR | Maximum | Unsecured debt | Notes payable | Level 2 | Unsecured Notes Two      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.50%