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Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Revolving credit facility - unsecured $ 10,000 $ 0
Bank term loans - unsecured 400,000  
Unamortized loan costs (9,069) (6,234)
Debt 1,114,999 1,242,883
Less: discount (2,680)  
Bank Term Loans    
Debt Instrument [Line Items]    
Bank term loans - unsecured 240,000 375,000
Senior Notes Due 2031    
Debt Instrument [Line Items]    
Bank term loans - unsecured 397,320 397,079
Less: discount (2,680) (2,921)
Private Placement Term Loans    
Debt Instrument [Line Items]    
Bank term loans - unsecured 400,000 400,000
Fannie Mae Term Loans    
Debt Instrument [Line Items]    
Fannie Mae term loans - secured, non-recourse $ 76,748 $ 77,038