Annual report pursuant to Section 13 and 15(d)

REAL ESTATE RELATED AND OTHER LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Large Loans (Details)

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REAL ESTATE RELATED AND OTHER LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Large Loans (Details) - Real Estate Related and other Loans
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 138,148      
Carrying Value $ 55,612      
Loan Count | loan 6      
Held-for-sale        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 138,148      
Carrying Value $ 55,612 $ 149,198 $ 230,200 $ 437,530
Loan Count | loan 6 7    
Weighted Average (as percent) 22.49% 20.54%    
Wtd Avg Coupon (as percent) 14.32%      
Weighted Average Life (Years) 6 months 6 days      
Held-for-sale | Individual Corporate Loan        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 60,997      
Carrying Value 55,465      
Prior Liens $ 554,480      
Loan Count | loan 1      
Weighted Average (as percent) 22.50%      
Wtd Avg Coupon (as percent) 22.50%      
Weighted Average Life (Years) 6 months 6 days      
Held-for-sale | Others        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 77,151      
Carrying Value 147      
Prior Liens $ 327,234      
Loan Count | loan 5      
Weighted Average (as percent) 20.00%      
Wtd Avg Coupon (as percent) 7.85%      
Weighted Average Life (Years) 6 months 6 days