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CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Narrative) (Details) $ in Thousands			3 Months Ended
	Jan. 13, 2016 EUR (€)	Mar. 15, 2015 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Related Party Transaction [Line Items]
Due from related parties			$ 22,427		$ 26,667
RSO
Related Party Transaction [Line Items]
Management agreement term, renewal threshold, percent			66.00%	66.00%
Management agreement term			1 year
Investor relations, percentage			50.00%
Due from related parties			$ 2,888		2,331
Apartment REIT III
Related Party Transaction [Line Items]
Due from related parties			1,000		739
Innovation Office REIT
Related Party Transaction [Line Items]
Due from related parties			3,000		2,400
Resource Real Estate Opportunity REIT Inc
Related Party Transaction [Line Items]
Due from related parties			539		277
RRE Opportunity REIT II
Related Party Transaction [Line Items]
Due from related parties			$ 580		$ 4,900
CVC Credit Partners Group Limited
Related Party Transaction [Line Items]
Related party loan receivable, description of variable rate basis	EURIBOR
Related party loan receivable, maximum borrowing capacity \| €	€ 3,600,000.0
Related party loan receivable, basis spread on variable rate	7.00%
CVC Credit Partners, L.P.
Related Party Transaction [Line Items]
Notes receivable, related party \| €				€ 2,400,000
Employees
Related Party Transaction [Line Items]
Related party loan receivable, description of variable rate basis			3-month LIBOR
Related party loan receivable, basis spread on variable rate			3.00%
Due from employee			$ 300
Payments to employees		$ 50
Quarterly Fee \| RSO
Related Party Transaction [Line Items]
Asset management fee, percentage			0.083%	0.083%