VARIABLE INTEREST ENTITIES - FINANCING RECEIVABLES (Credit Risk Profiles of Bank Loans) (Details) RSO (RSO [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	$ 1,935,793	$ 1,377,037
Bank Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	330,930	517,770
Bank Loans [Member] | Rating 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	291,214	448,224
Bank Loans [Member] | Rating 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	32,660	42,476
Bank Loans [Member] | Rating 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	5,424	18,806
Bank Loans [Member] | Rating 4 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	0	2,333
Bank Loans [Member] | Rating 5 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	1,350	3,554
Bank Loans [Member] | Held for Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and receivables	$ 282	$ 2,377