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Real Estate Activities Real Estate Activities - Acquisitions and Dispositions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 16, 2018
Oct. 31, 2018
Jun. 30, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]                
Payments to Acquire Real Estate     $ 11,400          
Proceeds from Sale of Real Estate     1,700          
Real Estate Property Sale Price $ 41,800              
Proceeds from Real Estate and Real Estate Joint Ventures $ 19,700              
Deferred costs and other assets, net       $ 131,043   $ 131,043   $ 112,046
Gains (Losses) on Sales of Investment Real Estate       $ 0 $ (9) 748 $ (374)  
Gain (Loss) on Sale of Properties           $ 723 $ 112  
Magnolia Mall Operating Restaurant [Member]                
Property, Plant and Equipment [Line Items]                
Gains (Losses) on Sales of Other Real Estate     $ 700          
Subsequent Event [Member]                
Property, Plant and Equipment [Line Items]                
Proceeds from Sale of Real Estate   $ 2,400            
Gains (Losses) on Sales of Other Real Estate   $ 1,000