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	Sep. 30, 2015	Dec. 31, 2014
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 47,284	$ 4,613
Middle-market Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 4,086
Percentage of Total Allowance	8.64%
Bank Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 1,084	$ 570
Percentage of Total Allowance	2.29%	12.36%
Whole Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 4,014	$ 3,758
Percentage of Total Allowance	8.49%	81.46%
Mezzanine Loans [Member]
Receivables with Imputed Interest [Line Items]
Allowance for Loan Loss	$ 38,080	$ 230
Percentage of Total Allowance	80.54%	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%