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Capital Markets Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]        
Costs associated with loan refinancing or payoff $ 38,407 $ 0 $ 38,407 $ 31,958
Unsecured Debt [Member]        
Debt Instrument [Line Items]        
Debt Covenants, Unencumbered Assets 150.00%   150.00%  
Debt Covenants, Debt Service Coverage Ratio 1.5   1.5  
Debt Covenants, Debt to Adjusted Total Assets 60.00%   60.00%  
Debt Covenants, Secured Debt to Adjusted Total Assets 40.00%   40.00%  
Unsecured Debt [Member] | Senior unsecured note payable, 3.75 percent, due August 15, 2029 [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.75%   3.75%  
Senior unsecured note payable, percentage of principal amount issued 99.168%   99.168%  
Debt Instrument, Face Amount $ 500,000   $ 500,000  
Unsecured Debt [Member] | Senior unsecured note payable, 5.75 percent, due August 15, 2022 [Member]        
Debt Instrument [Line Items]        
Principal amount of debt tendered     $ 219,400  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 5.75%   5.75%  
Debt Instrument, Face Amount $ 350,000   $ 350,000  
Debt Instrument, Unamortized Premium 38,300   38,300  
Debt Instrument, Increase, Accrued Interest     600  
Costs associated with loan refinancing or payoff     1,400  
Debt Tendered [Member] | Unsecured Debt [Member] | Senior unsecured note payable, 5.75 percent, due August 15, 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Premium 23,600   23,600  
Debt Redeemed [Member] | Unsecured Debt [Member] | Senior unsecured note payable, 5.75 percent, due August 15, 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Premium $ 13,300   $ 13,300