VARIABLE INTEREST ENTITIES BORROWINGS (Schedule of Linked Transactions) (Details) (RSO [Member], USD $)	Mar. 31, 2015	Feb. 28, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 282,100,000
Linked transactions, net at fair value	0		15,367,000
Long-term Debt, Weighted Average Interest Rate	2.46%		2.09%
Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			33,397,000
Linked transactions, net at fair value			48,605,000
Wells Fargo Bank, National Association [Member] | Linked Transactions [Member] | CMBS - Term Repurchase Facilities [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			4,941,000
Linked transactions, net at fair value			6,371,000
Debt Instrument, Number of Positions as Collateral			7
Long-term Debt, Weighted Average Interest Rate			1.67%
Repurchase Agreements [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	368,397,000
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
Debt Instrument, Number of Positions as Collateral			0
Long-term Debt, Weighted Average Interest Rate			0.00%
Repurchase Agreements [Member] | Wells Fargo Securities, LLC [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	14,536,000		10,442,000
Debt Instrument, Number of Positions as Collateral	1		1
Long-term Debt, Weighted Average Interest Rate	1.59%		1.66%
Repurchase Agreements [Member] | Wells Fargo Securities, LLC [Member] | Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			4,108,000
Linked transactions, net at fair value			6,233,000
Debt Instrument, Number of Positions as Collateral			2
Long-term Debt, Weighted Average Interest Rate			1.37%
Repurchase Agreements [Member] | Deutsche Bank Securities, Inc [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	53,249,000		33,783,000
Debt Instrument, Number of Positions as Collateral	8		8
Long-term Debt, Weighted Average Interest Rate	1.62%		1.62%
Repurchase Agreements [Member] | Deutsche Bank Securities, Inc [Member] | Linked Transactions [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount			24,348,000
Linked transactions, net at fair value			36,001,000
Debt Instrument, Number of Positions as Collateral			10
Long-term Debt, Weighted Average Interest Rate			1.57%
Repurchase Agreements [Member] | Wells Fargo Bank, National Association [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	28,229,000		61,189,000
Debt Instrument, Number of Positions as Collateral	78		104
Long-term Debt, Weighted Average Interest 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	$ 29,391,000		$ 24,967,000
Debt Instrument, Number of Positions as Collateral	34		33
Long-term Debt, Weighted Average Interest Rate	1.37%		1.35%