INVESTMENTS IN RESIDENTIAL MORTGAGE LOANS - Schedule of Residential Mortgage Loans Outstanding by Loan Type, Excluding REO (Footnote) (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Feb. 28, 2013	Sep. 30, 2015
Mortgage Loans on Real Estate [Line Items]
Threshold period past due		60 days
Net unamortized discounts and (premiums)		$ (6.7)
Reverse Mortgage Loans [Member]
Mortgage Loans on Real Estate [Line Items]
Interest in reverse mortgage loans	70.00%	70.00%
Total unpaid principal balance		$ 0.4
Percentage of loans that have reached a termination event		75.00%
Performing Loans [Member] | Upper Range [Member]
Mortgage Loans on Real Estate [Line Items]
Threshold period past due		30 days
Non-Performing Loans [Member] | GNMA EBO [Member]
Mortgage Loans on Real Estate [Line Items]
Unpaid Principal Balance		$ 271.3