INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Deferred Tax Assets
Basis difference in operating partnerships	$ 7,065	$ 6,795
Tax intangibles	2,353	778
Unrealized gains (losses)	1,974	616
Unrealized gains (losses) - derivatives	3,564	0
Valuation allowance	(3,564)	0
Total Deferred Tax Assets	$ 11,392	$ 8,189