CERTAIN RELATIONSHIPS AND RELATED PARTY TRANSACTIONS (Fees From Unconsolidated Investment Entities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Commercial Finance, Four Investment Entities [Member]
Related Party Transaction [Line Items]
Amount waived of the fund management fees from commercial finance investment entities	$ 17	$ 105	$ 97	$ 605
Real estate [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities:	11,464	8,992	33,071	26,436
Discounts recorded	35	38	245	112
Financial fund management [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities:	774	794	2,341	2,861
Commercial finance investment entities [Member]
Related Party Transaction [Line Items]
Fees from unconsolidated investment entities:	0	0	0	0
CVC Credit Partners, L.P. [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	219	211	694	836
RRE Opportunity REIT I [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	817	641	2,639	1,556
Dividends paid	87	30	131	88
RRE Opportunity REIT II [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	722	642	2,221	1,590
Dividends paid	42	0	62	0
Innovation Office REIT [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	283	0	1,486	0
LEAF [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	36	31	113	95
Payment for sub-servicing the commercial finance investment partnerships	(12)	(52)	(53)	(253)
1845 Walnut Associates Ltd. [Member]
Related Party Transaction [Line Items]
Payment for rent and related expenses	(213)	(154)	(629)	(561)
Property management fees	47	56	123	149
Brandywine Construction & Management, Inc. [Member]
Related Party Transaction [Line Items]
Brandywine Construction & Management, Inc.: payment for property management of hotel property	(67)	(57)	(200)	(169)
Atlas Energy, L.P. [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	99	52	123	124
Ledgewood P.C. [Member]
Related Party Transaction [Line Items]
Ledgewood P.C.: payment for legal services	(3)	(98)	(92)	(165)
Graphic Images, LLC [Member]
Related Party Transaction [Line Items]
Graphic Images, LLC: payment for printing services	(36)	(27)	(120)	(116)
The Bancorp, Inc. [Member]
Related Party Transaction [Line Items]
Reimbursement of related party costs	0	29	0	84
9 Henmar LLC [Member]
Related Party Transaction [Line Items]
9 Henmar LLC: payment of broker/consulting fees	$ (4)	$ (3)	$ (21)	$ (21)