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Real Estate Activities Real Estate Activities - Acquisitions and Dispositions(Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2017
Apr. 30, 2017
Aug. 31, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]                  
Payments to Acquire Real Estate $ 8,900,000                
Repayments of Secured Debt             $ 150,000,000 $ 280,327,000  
Deferred costs and other assets, net 99,886,000       $ 99,886,000   99,886,000   $ 93,800,000
Gains (Losses) on Sales of Investment Real Estate         (308,000) $ 20,887,000 (365,000) 22,922,000  
Gain (Loss) on Sale of Properties             121,000 22,931,000  
Asset Impairment Charges         $ 53,917,000 $ 14,118,000 $ 53,917,000 $ 14,724,000  
Beaver Valley Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Fair Value Inputs, Cap Rate     15.60%            
Proceeds from Sale of Real Estate     $ 24,200            
Gain Loss On Sale Of Real Estate     0            
Anchor located at Valley Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Payments to Acquire Real Estate   $ 2,500,000              
Crossroads Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Fair Value Inputs, Cap Rate       15.50%          
Proceeds from Sale of Real Estate       $ 24,800          
Gain Loss On Sale Of Real Estate       $ 0          
Beaver Valley Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Proceeds from Sale of Real Estate 600,000                
Gain Loss On Sale Of Real Estate     $ 400,000            
Anchor located at Valley View Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Payments to Acquire Real Estate   $ 2,500,000              
Non Operating Parcel at Beaver Valley Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Proceeds from Sale of Real Estate 3,600,000                
Gain Loss On Sale Of Real Estate 100,000                
Logan Valley Mall [Member]                  
Property, Plant and Equipment [Line Items]                  
Impairment Of Assets $ 38,400,000