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ACQUISITIONS AND DISPOSITIONS - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 22, 2016
USD ($)
Dec. 17, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
property
Business Acquisition [Line Items]        
Cash payments to acquire real estate $ 2,700   $ 2,667 $ 30,125
Number of properties acquired with existing leases | property       3
Transaction-related costs incurred in connection with acquisitions of real estate     $ 1,200  
Cross Bay Commons        
Business Acquisition [Line Items]        
Cash payments to acquire real estate   $ 27,000    
Deferral period of gains from sale of other properties, for tax purposes     180 days  
Cross Bay Commons        
Business Acquisition [Line Items]        
Assets of Variable Interest Entity     $ 12,400 $ 29,500
Liabilities of Variable Interest Entity     $ 14,200 $ 2,500