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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
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(3) 3,166 3,266  
Notes payable 371,834 371,734  
Unsecured debt [Member] | Borrowings [Member]      
Debt Instrument [Line Items]      
Notes payable $ 371,834 371,734  
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]      
Debt Instrument [Line Items]      
Interest rate 4.40%    
Unsecured debt $ 375,000 375,000  
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Unsecured debt $ 0 $ 0  
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1125%    
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1625%