Quarterly report pursuant to Section 13 or 15(d)

TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES (Narrative) (Details)

v3.7.0.1
TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES (Narrative) (Details)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2016
USD ($)
Apr. 30, 2010
USD ($)
security
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2006
Related Party Transaction [Line Items]                
Lease term         1 year      
Period management fee earned         12 months      
Manager advisory fee (as percent)     1.50%   1.50%      
Incentive compensation percentage (as percent)     25.00%   25.00%      
Simple interest rate in incentive calculation (as percent)     10.00%   10.00%      
Shares held by Fortress and affiliates (in shares) | shares     5.1   5.1      
Due to affiliates     $ 893   $ 893   $ 892  
Investments in and advances to affiliates, at fair value, gross additions   $ 75,000            
Expected yield (as percent)   22.50%            
Proceeds from collection of notes receivable $ 109,900              
Corporate loan investment     2,114   2,114   $ 1,950  
Interest income     6,395 $ 20,421 14,283 $ 41,460    
CDO                
Related Party Transaction [Line Items]                
Number of securities (in securities) | security   2            
Subprime Portfolio I                
Related Party Transaction [Line Items]                
Servicing fee percentage (as percent)               0.50%
Subprime Portfolio I | Subprime Mortgage Loans Subject to Call Option                
Related Party Transaction [Line Items]                
Total securitized loans (unpaid principal balance)     218,100   218,100      
Subprime Portfolio II | Subprime Mortgage Loans Subject to Call Option                
Related Party Transaction [Line Items]                
Total securitized loans (unpaid principal balance)     $ 325,200   $ 325,200      
Affiliated Entity                
Related Party Transaction [Line Items]                
Stock options outstanding (in shares) | shares     3.9   3.9      
Corporate loan investment     $ 68,100   $ 68,100      
Interest income     $ 3,700 $ 8,500 $ 7,100 $ 16,600