VARIABLE INTEREST ENTITIES FINANCING RECEIVABLES (Credit Risk Profiles and Middle Market Loans) (Details) RSO (RSO [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	$ 1,969,858	$ 1,935,793
Loans Receivable Held-for-sale, Amount	248,451	111,736
Bank Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	298,209	330,930
Bank Loans [Member] | Rating 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	200,966	291,214
Bank Loans [Member] | Rating 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	16,081	32,660
Bank Loans [Member] | Rating 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	5,257	5,424
Bank Loans [Member] | Rating 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	1,798	0
Bank Loans [Member] | Rating 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	215	1,350
Bank Loans [Member] | Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	73,900	282
Loans Receivable Held-for-sale, Amount	73,892	282
Middle-market Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	294,793	250,113
Middle-market Loans [Member] | Rating 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	0	0
Middle-market Loans [Member] | Rating 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	284,937	240,245
Middle-market Loans [Member] | Rating 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	4,900	9,868
Middle-market Loans [Member] | Rating 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	0	0
Middle-market Loans [Member] | Rating 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	4,956	0
Middle-market Loans [Member] | Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Held-for-sale, Amount	$ 0	$ 0