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Mortgage and Other Indebtedness - Consolidated Indebtedness by Type of Interest Rate (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Net debt premiums and issuance costs, net $ (4,330)  
Total $ 1,578,328 $ 1,699,239
Ratio (as percent) 100.00%  
Weighted Average Interest Rate (as percent) 4.10%  
Weighted Average Maturity (Years) 5 years 12 days  
Fixed rate debt    
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,423,255  
Ratio (as percent) 90.00%  
Weighted Average Interest Rate (as percent) 4.13%  
Weighted Average Maturity (Years) 5 years 1 month 18 days  
Variable rate debt    
Debt Instrument [Line Items]    
Long-term debt, gross $ 159,403  
Ratio (as percent) 10.00%  
Weighted Average Interest Rate (as percent) 3.71%  
Weighted Average Maturity (Years) 3 years 6 months 24 days  
Floating Rate Debt Hedged | Variable rate debt    
Debt Instrument [Line Items]    
Total $ 337,400  
Weighted Average Maturity (Years) 1 year 6 months