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INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Investments in Unconsolidated Joint Ventures (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]    
Investment in unconsolidated joint ventures $ 35,302 $ 35,441
Grace Lake JV, LLC    
Schedule of Equity Method Investments [Line Items]    
Investment in unconsolidated joint ventures 4,192 4,908
24 Second Avenue Holdings LLC    
Schedule of Equity Method Investments [Line Items]    
Investment in unconsolidated joint ventures $ 31,110 $ 30,533