VARIABLE INTEREST ENTITIES LOANS HELD FOR INVESTMENT (Weighted Average Life of Commercial Real Estate Loans, at Amortized Cost) (Details) RSO - RSO [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Middle-market Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less than one year	$ 0	$ 0
Loans held for investment, amortized cost	330,995	250,113
Greater than one year and less than five years	191,670	132,353
Five years or greater	139,325	117,760
Bank Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Less than one year	6,580	7,829
Loans held for investment, amortized cost	187,785	330,930
Greater than one year and less than five years	175,208	274,332
Five years or greater	5,997	48,769
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2014	3,250	0
2015	60,438	60,473
2016 and Thereafter	1,509,734	1,286,557
Loans held for investment, amortized cost	1,573,422	1,347,030
Commercial Real Estate Loans [Member] | Whole Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2014	3,250	0
2015	27,691	27,665
2016 and Thereafter	1,471,662	1,235,927
Loans held for investment, amortized cost	1,502,603	1,263,592
Commercial Real Estate Loans [Member] | Mezzanine Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2014	0	0
2015	16,750	16,736
2016 and Thereafter	38,072	50,630
Loans held for investment, amortized cost	54,822	67,366
Commercial Real Estate Loans [Member] | B Notes [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
2014	0	0
2015	15,997	16,072
2016 and Thereafter	0	0
Loans held for investment, amortized cost	$ 15,997	$ 16,072