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Real Estate Activities - Dispositions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2019
Jul. 31, 2019
Apr. 30, 2019
Mar. 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 26, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Gains (losses) on sales of investment real estate         $ 1,171 $ 0 $ 2,684 $ 748  
Gain on debt extinguishment         29,600 $ 0 $ 24,832 $ 0  
Wyoming Valley Mall | Commercial Real Estate | Mortgages                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Debt default, amount                 $ 72,800
Impairment losses $ 32,200                
Written off remaining carrying value of property $ 43,200                
Gain on debt extinguishment         $ 29,600        
Undeveloped Land Parcel, Gainesville, Florida                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of real estate       $ 5,000          
Gains (losses) on sales of investment real estate       (1,500)          
Disposal group, consideration       $ 15,000          
Undeveloped Land Parcel, New Garden township, Pennsylvania                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Proceeds from sale of real estate     $ 8,250            
Gains (losses) on sales of investment real estate     200            
Disposal group, consideration     11,000            
Contingent liability     1,250            
Undeveloped Land Parcel, New Garden township, Pennsylvania | Preferred Stock                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Disposal group, consideration transferred, equity instruments     2,750            
Whole Foods Store, Adjacent To Exton Square Mall                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Gains (losses) on sales of investment real estate     1,300            
Disposal group, consideration     $ 22,100            
Valley View Mall In La Crosse Wisconsin                  
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                  
Gains (losses) on sales of investment real estate   $ 1,200              
Disposal group, consideration   $ 1,400