INCOME TAXES - Components of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets
Basis difference in operating partnerships	$ 0	$ 2,023
Unrealized gains (losses)	1,461	99
Unrealized gains (losses) - derivatives	5,781	5,668
Valuation allowance	(5,781)	(5,668)
Total Deferred Tax Assets	$ 1,461	$ 2,122