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Mortgage and Other Indebtedness, Net (Schedule of Unsecured Lines of Credit) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total Outstanding $ 1,114,969,000 $ 1,090,810,000
Wells Fargo Bank    
Debt Instrument [Line Items]    
Line of credit, extension fee 0.15%  
Wells Fargo - Facility A    
Debt Instrument [Line Items]    
Total Capacity $ 500,000,000  
Total Outstanding 0  
First Tennessee    
Debt Instrument [Line Items]    
Total Capacity 100,000,000  
Total Outstanding $ 53,249,000  
First Tennessee | Wells Fargo Bank    
Debt Instrument [Line Items]    
Line of credit, extension fee 0.20%  
Wells Fargo - Facility B    
Debt Instrument [Line Items]    
Total Capacity $ 500,000,000  
Total Outstanding 62,552,000  
Unsecured lines of credit    
Debt Instrument [Line Items]    
Total Capacity 1,100,000,000  
Total Outstanding 115,801,000  
Wells Fargo Bank | Letter of Credit    
Debt Instrument [Line Items]    
Total Capacity 30,000,000  
First Tennessee Bank    
Debt Instrument [Line Items]    
Total Capacity $ 20,000,000