Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES (Narrative) (Details)
$ in Thousands, shares in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
Sep. 30, 2016
USD ($)
Apr. 30, 2010
USD ($)
security
Sep. 30, 2017
USD ($)
security
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
security
shares
Sep. 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  
Number of securities (in securities) | security       1   1      
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 $ 69,500 $ 109,900              
Interest income       $ 8,418 $ 32,310 $ 22,701 $ 73,770    
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)       209,000   209,000      
Subprime Portfolio II | Subprime Mortgage Loans Subject to Call Option                  
Related Party Transaction [Line Items]                  
Total securitized loans (unpaid principal balance)       $ 315,600   $ 315,600      
Affiliated Entity                  
Related Party Transaction [Line Items]                  
Stock options outstanding (in shares) | shares       3.9   3.9      
Interest income       $ 6,900 $ 19,700 $ 14,000 $ 36,200