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VARIABLE INTEREST ENTITIES, CONTINGENT LIABILITIES AND CONSOLIDATED JOINT VENTURES - MCB Real Estate, LLC (Details)
1 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
Oct. 31, 2016
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Number of VIEs | item     3    
Investment in unconsolidated joint ventures     $ 10,833,000 $ 11,350,000  
Write-off of unbilled straight-line rent receivable       $ 89,000  
Purchase of non-controlling interest     (446,000)    
Payment made to purchase partner's interest in consolidated joint venture     $ 446,000    
Percentage of rental income     1.00% 1.00% 1.00%
Mortgages payable     $ 394,898,000 $ 331,055,000  
Net book value of property     2,628,000    
Impairment charge     0 0 $ 1,093,000
Real estate expenses     $ 8,931,000 6,047,000 $ 4,407,000
Consolidated JV          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Number of joint ventures with controlling interest | item     5    
Consolidated JV | Deptford, New Jersey          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Purchase of Minority Interest Percentage 5.00%        
Equity Method Investment Ownership Percentage Control Obtained 100.00%        
MCB Real Estate LLC And Its Affiliates | Consolidated JV          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Number of joint ventures with controlling interest | item     4    
Investment in unconsolidated joint ventures       10,522,000  
Investment in consolidated joint ventures     $ 10,522,000    
MCB Real Estate LLC And Its Affiliates | Consolidated JV | Deptford, New Jersey          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Purchase of Minority Interest Percentage 5.00% 5.00%      
Equity Method Investment Ownership Percentage Control Obtained 100.00%        
Payment made to purchase partner's interest in consolidated joint venture $ 446,000        
MCB Real Estate LLC And Its Affiliates | Consolidated JV | Pathmark supermarket in Philadelphia, Pennsylvania          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Write off of Intangible Lease Liabilities       124,000  
Write-off of unbilled straight-line rent receivable       89,000  
Write off of tenant origination costs       $ 380,000  
Investment in consolidated joint ventures     3,079,000    
Percentage of rental income       0.90% 0.30%
Mortgages payable     4,397,000    
Net book value of property     7,164,000    
Impairment charge     0    
Real estate expenses     299,000 $ 93,000 $ 0
Mortgage interest     175,000 182,000 $ 34,000
Increase in rental income       $ 35,000  
Paid-in Capital          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Purchase of non-controlling interest     $ (436,000)    
Paid-in Capital | MCB Real Estate LLC And Its Affiliates | Consolidated JV | Deptford, New Jersey          
Consolidated VIEs Carrying Amount of Assets and Liabilities          
Purchase of non-controlling interest $ 436,000