VARIABLE INTEREST ENTITIES FINANCING RECEIVABLES (Impaired Loans) (Details) RSO (RSO [Member], USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Net Balance	$ 173,992,000	$ 169,612,000
Unpaid Principal Balance	173,992,000	169,612,000
Specific Allowance	(2,598,000)	(570,000)
Average Investment in Impaired Loans	171,158,000	170,599,000
Interest Income Recognized	16,824,000	15,686,000
Whole Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	128,108,000	128,108,000
Loans with a specific valuation allowance, Recorded balance	0	0
Net Balance	128,108,000	128,108,000
Loans without a specific valuation allowance, Unpaid Principal Balance	128,108,000	128,108,000
Loans with a specific valuation allowance, Unpaid Principal Balance	0	0
Unpaid Principal Balance	128,108,000	128,108,000
Specific Allowance	0	0
Loans without a specific valuation allowance, Average Investment in Impaired Loans	130,445,000	130,445,000
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	130,445,000	130,445,000
Loans without a specific valuation allowance, Interest Income Recognized	13,617,000	12,679,000
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	13,617,000	12,679,000
B Notes [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	0	0
Loans with a specific valuation allowance, Recorded balance	0	0
Net Balance	0	0
Loans without a specific valuation allowance, Unpaid Principal Balance	0	0
Loans with a specific valuation allowance, Unpaid Principal Balance	0	0
Unpaid Principal Balance	0	0
Specific Allowance	0	0
Loans without a specific valuation allowance, Average Investment in Impaired Loans	0	0
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	0	0
Loans without a specific valuation allowance, Interest Income Recognized	0	0
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	0	0
Mezzanine Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	38,072,000	38,072,000
Loans with a specific valuation allowance, Recorded balance	0	0
Net Balance	38,072,000	38,072,000
Loans without a specific valuation allowance, Unpaid Principal Balance	38,072,000	38,072,000
Loans with a specific valuation allowance, Unpaid Principal Balance	0	0
Unpaid Principal Balance	38,072,000	38,072,000
Specific Allowance	0	0
Loans without a specific valuation allowance, Average Investment in Impaired Loans	38,072,000	38,072,000
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	38,072,000	38,072,000
Loans without a specific valuation allowance, Interest Income Recognized	3,186,000	2,859,000
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	3,186,000	2,859,000
Bank Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	0	0
Loans with a specific valuation allowance, Recorded balance	215,000	1,350,000
Net Balance	215,000	1,350,000
Loans without a specific valuation allowance, Unpaid Principal Balance	0	0
Loans with a specific valuation allowance, Unpaid Principal Balance	215,000	1,350,000
Unpaid Principal Balance	215,000	1,350,000
Specific Allowance	(86,000)	(570,000)
Loans without a specific valuation allowance, Average Investment in Impaired Loans	0	0
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	0	0
Loans without a specific valuation allowance, Interest Income Recognized	0	0
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	0	0
Middle-market Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	0	0
Loans with a specific valuation allowance, Recorded balance	4,956,000	0
Net Balance	4,956,000	0
Loans without a specific valuation allowance, Unpaid Principal Balance	0	0
Loans with a specific valuation allowance, Unpaid Principal Balance	4,956,000	0
Unpaid Principal Balance	4,956,000	0
Specific Allowance	(2,512,000)	0
Loans without a specific valuation allowance, Average Investment in Impaired Loans	0	0
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	0	0
Loans without a specific valuation allowance, Interest Income Recognized	0	0
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	0	0
Residential Mortgage Loans [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	2,641,000	2,082,000
Loans with a specific valuation allowance, Recorded balance	0	0
Net Balance	2,641,000	2,082,000
Loans without a specific valuation allowance, Unpaid Principal Balance	2,641,000	2,082,000
Loans with a specific valuation allowance, Unpaid Principal Balance	0	0
Unpaid Principal Balance	2,641,000	2,082,000
Specific Allowance	0	0
Loans without a specific valuation allowance, Average Investment in Impaired Loans	2,641,000	2,082,000
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	2,641,000	2,082,000
Loans without a specific valuation allowance, Interest Income Recognized	21,000	148,000
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	21,000	148,000
Loans Receivable - Related Party [Member]
Financing Receivable, Impaired [Line Items]
Loans without a specific valuation allowance, Recorded balance	0	0
Loans with a specific valuation allowance, Recorded balance	0	0
Net Balance	0	0
Loans without a specific valuation allowance, Unpaid Principal Balance	0	0
Loans with a specific valuation allowance, Unpaid Principal Balance	0	0
Unpaid Principal Balance	0	0
Specific Allowance	0	0
Loans without a specific valuation allowance, Average Investment in Impaired Loans	0	0
Loans with specific valuation allowance, Average Investment in Impaired Loans	0	0
Average Investment in Impaired Loans	0	0
Loans without a specific valuation allowance, Interest Income Recognized	0	0
Loans with a specific valuation allowance, Interest Income Recognized	0	0
Interest Income Recognized	$ 0	$ 0