CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Fees From Unconsolidated Investment Entities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Dividends paid	$ 1,673	$ 2,289	$ 2,242
Commercial Finance, Four Investment Entities [Member]
Related Party Transaction [Line Items]
Amount waived of the fund management fees from commercial finance investment entities	109	683	1,800
Real estate [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities:	13,276	5,969	12,320
Discounts recorded	(435)	82	179
Financial fund management [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities:	1,218	1,254	1,124
Commercial Finance [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities:	0	0	0
RSO [Member]
Related Party Transaction [Line Items]
Management, incentive and servicing fees	12,083	11,917	10,179
Reimbursement of costs and expenses	5,650	5,196	3,980
Dividends paid	1,674	2,289	2,241
CVC Credit Partners, L.P. [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	859	1,037	1,195
RRE Opportunity REIT [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	3,733	2,227	1,633
Dividends paid	175	117	114
Payment for printing services	(24,575)	(26,724)	(11,036)
Resource Real Estate Opportunity REIT II, Inc. [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	4,912	2,342	0
Dividends paid	82	0	0
Payment for printing services	(11,027)	(1,702)	0
Innovation Office REIT [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	1,989	0	0
Apartment REIT III [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	739	0	0
LEAF [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	159	129	213
Payment for sub-servicing the commercial finance investment partnerships (3)	(53)	(293)	(898)
Payment for rent and related expenses	0	0	(543)
1845 Walnut Associates Ltd. [Member]
Related Party Transaction [Line Items]
Payment for rent and related expenses	(843)	(767)	(702)
Property management fees	170	205	122
Brandywine Construction & Management, Inc. [Member]
Related Party Transaction [Line Items]
Payment for property management of hotel property	(264)	(232)	(226)
Atlas Energy, L.P. [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	166	163	240
Ledgewood P.C. [Member]
Related Party Transaction [Line Items]
Payment for legal services	(116)	(180)	(240)
Graphic Images, LLC [Member]
Related Party Transaction [Line Items]
Payment for printing services	(151)	(156)	(179)
The Bancorp, Inc. [Member]
Related Party Transaction [Line Items]
Reimbursement of costs and expenses	0	111	114
9 Henmar LLC [Member]
Related Party Transaction [Line Items]
Payment of broker/consulting fees	$ (37)	$ (38)	$ (41)