VARIABLE INTEREST ENTITIES BORROWINGS (Schedule of Linked Transactions) (Details) - RSO [Member] $ in Thousands	Sep. 30, 2015 USD ($) Loan	Aug. 31, 2015 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2014 USD ($) Loan
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 223,700	$ 282,100
Linked transactions, net at fair value	$ 0			$ 15,367
Weighted Average Borrowing Rate	2.61%			2.09%
Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 33,397
Linked transactions, net at fair value				48,605
Wells Fargo Bank, National Association [Member] | Linked Transactions [Member] | CMBS - Term Repurchase Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				4,941
Linked transactions, net at fair value				$ 6,371
Number of Positions as Collateral | Loan				7
Weighted Average Borrowing Rate				1.67%
Repurchase Agreements [Member] | JP Morgan Securities, LLC [Member] | Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 0
Linked transactions, net at fair value				$ 0
Number of Positions as Collateral | Loan				0
Weighted Average Borrowing Rate				0.00%
Repurchase Agreements [Member] | Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 13,609			$ 10,442
Number of Positions as Collateral | Loan	4			1
Weighted Average Borrowing Rate	1.85%			1.66%
Repurchase Agreements [Member] | Wells Fargo Securities, LLC [Member] | Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 4,108
Linked transactions, net at fair value				$ 6,233
Number of Positions as Collateral | Loan				2
Weighted Average Borrowing Rate				1.37%
Repurchase Agreements [Member] | Deutsche Bank Securities, Inc [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 49,939			$ 33,783
Number of Positions as Collateral | Loan	20			8
Weighted Average Borrowing Rate	1.73%			1.62%
Repurchase Agreements [Member] | Deutsche Bank Securities, Inc [Member] | Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 24,348
Linked transactions, net at fair value				$ 36,001
Number of Positions as Collateral | Loan				10
Weighted Average Borrowing Rate				1.57%
Repurchase Agreements [Member] | Wells Fargo Bank, National Association [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 55,149			$ 61,189
Number of Positions as Collateral | Loan	163			104
Weighted Average Borrowing Rate	2.75%			2.75%
Repurchase Agreements [Member] | Wells Fargo Bank, National Association [Member] | CMBS - Term Repurchase Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 26,326			$ 24,967
Number of Positions as Collateral | Loan	27			33
Weighted Average Borrowing Rate	1.41%			1.35%