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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Mar. 08, 2017
Debt Instrument [Line Items]      
Total principal amount $ 375,000 $ 375,000  
Unamortized discount and debt issuance costs 3,266 3,665  
Total 371,734 $ 371,335  
Unsecured Debt [Member] | Unsecured Notes One [Member]      
Debt Instrument [Line Items]      
Unsecured debt $ 375,000    
Interest rate, stated percentage 4.40%   4.40%
Unsecured Debt [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Unsecured debt $ 0    
Minimum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1125%    
Maximum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1625%