VARIABLE INTEREST ENTITIES LOANS HELD FOR INVESTMENT (Weighted Average Life of Middle-Market and Bank Loans, at Amortized Cost) (Details) RSO (RSO [Member], Bank Loans [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
RSO [Member] | Bank Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less than one year	$ 1,625	$ 7,829
Greater than one year and less than five years	282,658	274,332
Five years or greater	13,926	48,769
Loans held for investment, amortized cost	$ 298,209	$ 330,930