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	Sep. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less than one year	$ 2,518	$ 7,829
Greater than one year and less than five years	145,216	274,332
Five years or greater	4,893	48,769
Loans held for investment, amortized cost	$ 152,627	$ 330,930