VARIABLE INTEREST ENTITIES LOANS HELD FOR INVESTMENT (Allocation of Allowance for Loan Loss for Commercial and Bank Loans) (Details) RSO - RSO [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 46,319	$ 4,613
Middle-market Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 3,207
Percentage of Total Allowance	6.92%
Bank Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 997	$ 570
Percentage of Total Allowance	2.15%	12.36%
Whole Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 3,950	$ 3,758
Percentage of Total Allowance	8.53%	81.46%
Mezzanine Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 38,145	$ 230
Percentage of Total Allowance	82.36%	4.99%
B Notes [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 20	$ 55
Percentage of Total Allowance	0.04%	1.19%