INVESTMENT IN UNCONSOLIDATED JOINT VENTURES - Investments in Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	$ 34,564	[1]	$ 35,441
Grace Lake JV, LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	3,925		4,908
24 Second Avenue Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated joint ventures	$ 30,639		$ 30,533

[1] Includes amounts relating to consolidated variable interest entities. See Note 3.