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
 1 Months Ended 3 Months Ended
Sep. 30, 2016
USD ($)
Apr. 30, 2010
USD ($)
security
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
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%      
Incentive compensation percentage (as percent)     25.00%      
Simple interest rate in incentive calculation (as percent)     10.00%      
Shares held by Fortress and affiliates (in shares) | shares     5,100,000      
Stock options outstanding (in shares) | shares     5,086,576      
Due to affiliates     $ 892   $ 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     2,032   $ 1,950  
Interest income     $ 7,888 $ 21,039    
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%
Affiliated Entity            
Related Party Transaction [Line Items]            
Stock options outstanding (in shares) | shares     3,900,000      
Corporate loan investment     $ 64,400      
Interest income     3,400 $ 8,100    
Subprime Mortgage Loans Subject to Call Option | Subprime Portfolio I            
Related Party Transaction [Line Items]            
Total securitized loans (unpaid principal balance)     227,300      
Subprime Mortgage Loans Subject to Call Option | Subprime Portfolio II            
Related Party Transaction [Line Items]            
Total securitized loans (unpaid principal balance)     $ 338,400