FINANCING RECEIVABLES (Loan Portfolio Aging Analysis as of the Dates Indicated at Cost Basis) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 39,990   $ 1,994
Current (2) 2,263,699   2,041,612
Total Loan and Lease Receivable 2,303,689   2,043,606
Total Loans Greater Than 90 days and accruing 0   0
First lien loans held for sale at fair value 95,946   113,675
Individually evaluated for impairment 42,021   570
Whole Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Current (2) 1,630,801   1,263,592
Total Loan and Lease Receivable 1,630,801   1,263,592
Total Loans Greater Than 90 days and accruing 0   0
Individually evaluated for impairment 2,200    
B Notes [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Current (2) 15,934   16,072
Total Loan and Lease Receivable 15,934   16,072
Total Loans Greater Than 90 days and accruing 0   0
Mezzanine Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 38,072   0
Current (2) 7,300   67,366
Total Loan and Lease Receivable 45,372   67,366
Total Loans Greater Than 90 days and accruing 0   0
Individually evaluated for impairment   $ 38,100  
Bank Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,544   1,350
Current (2) 132,973   329,580
Total Loan and Lease Receivable 134,517   330,930
Total Loans Greater Than 90 days and accruing 0   0
Individually evaluated for impairment 1,282   570
Middle-market Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Current (2) 379,452   250,113
Total Loan and Lease Receivable 379,452   250,113
Total Loans Greater Than 90 days and accruing 0   0
Individually evaluated for impairment 0   0
Direct financing leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 226    
Current (2) 1,170    
Total Loan and Lease Receivable 1,396    
Total Loans Greater Than 90 days and accruing 0    
Residential Mortgage Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 148   644
Current (2) 96,069   113,612
Total Loan and Lease Receivable 96,217   114,256
Total Loans Greater Than 90 days and accruing 0   0
First lien loans held for sale at fair value 94,471   113,393
Loans Receivable - Related Party [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due     0
Current (2)     1,277
Total Loan and Lease Receivable     1,277
Total Loans Greater Than 90 days and accruing     0
Individually evaluated for impairment 0   0
Financing Receivables, 30 to 59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,583   443
Financing Receivables, 30 to 59 Days Past Due [Member] | Whole Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | B Notes [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Mezzanine Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Bank Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 1,544   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Middle-market Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 30 to 59 Days Past Due [Member] | Direct financing leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 12    
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential Mortgage Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 27   443
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans Receivable - Related Party [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due     0
Financing Receivables, 60 to 89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 38,327   82
Financing Receivables, 60 to 89 Days Past Due [Member] | Whole Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | B Notes [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Mezzanine Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 38,072   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Bank Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Middle-market Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, 60 to 89 Days Past Due [Member] | Direct financing leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 214    
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential Mortgage Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 41   82
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans Receivable - Related Party [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due     0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 80   1,469
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Whole Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | B Notes [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Mezzanine Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Bank Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   1,350
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Middle-market Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0   0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Direct financing leases [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due 0    
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential Mortgage Loans [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due $ 80   119
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans Receivable - Related Party [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Total Past Due     $ 0