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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Core Portfolio (Details) - Core Portfolio
ft² in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2016
property
Jan. 31, 2016
USD ($)
ft²
Sep. 30, 2016
USD ($)
ft²
Sep. 30, 2016
USD ($)
ft²
Schedule of Equity Method Investments [Line Items]        
Percentage of interests acquired 20.00%      
Consideration transferred | $       $ 487,225
Number of retail properties (in properties) | property 17      
Crossroads        
Schedule of Equity Method Investments [Line Items]        
Equity ownership percentage     49.00% 49.00%
Square footage of real estate property (in square feet)     311 311
Georgetown Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity ownership percentage     50.00% 50.00%
Square footage of real estate property (in square feet)     28 28
Chicago Street Retail Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity ownership percentage     88.43% 88.43%
Square footage of real estate property (in square feet)     87 87
Gotham Plaza        
Schedule of Equity Method Investments [Line Items]        
Square footage of real estate property (in square feet)   123    
Percentage of interests acquired   49.00%    
Consideration transferred | $   $ 39,800    
Percentage of long-term debt assumed   49.00%    
Debt assumed (included in Mortgage and other notes payable) | $   $ 21,400    
Brandywine Portfolio        
Schedule of Equity Method Investments [Line Items]        
Equity ownership percentage     22.22% 22.22%
Square footage of real estate property (in square feet)     1,000 1,000
Repayments of long-term debt | $     $ 140,000  
Washington D.C.        
Schedule of Equity Method Investments [Line Items]        
Number of retail properties (in properties) | property 16      
Alexandria, Virginia        
Schedule of Equity Method Investments [Line Items]        
Number of retail properties (in properties) | property 1