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Real Estate Activities - Dispositions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jul. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Gains (losses) on sales of investment real estate     $ 1,513 $ 748 $ 1,513 $ 748  
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            
Texas Roadhouse Outparcel to Valley View Mall | Subsequent Event              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]              
Disposal group, consideration             $ 1,400