Annual report pursuant to Section 13 and 15(d)

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

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REAL ESTATE RELATED AND OTHER LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Schedule of Loans (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
loan
Dec. 31, 2015
USD ($)
loan
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Real Estate Related and other Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 138,148,000      
Carrying Value $ 55,612,000      
Loan Count | loan 6      
Delinquent Face Amount $ 77,151,000      
Real Estate Related and other Loans | Held-for-sale        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount 138,148,000      
Carrying Value 55,612,000 $ 149,198,000 $ 230,200,000 $ 437,530,000
Valuation Allowance (Reversal) $ 3,826,000      
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      
Floating Rate Loans as a % of Face Amount (as percent) 12.90%      
Delinquent Face Amount $ 77,151,000      
Real Estate Related and other Loans | Mezzanine Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount 17,800,000      
Carrying Value $ 0      
Loan Count | loan 2      
Real Estate Related and other Loans | Mezzanine Loans | Held-for-sale        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 17,767,000      
Carrying Value 0 $ 19,433,000    
Valuation Allowance (Reversal) $ 0      
Loan Count | loan 2 3    
Weighted Average (as percent) 0.00% 8.00%    
Wtd Avg Coupon (as percent) 8.39%      
Weighted Average Life (Years) 6 days      
Floating Rate Loans as a % of Face Amount (as percent) 100.00%      
Delinquent Face Amount $ 17,767,000      
Real Estate Related and other Loans | Corporate Loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 45,700,000      
Loan Count | loan 2      
Real Estate Related and other Loans | Corporate Loans | Held-for-sale        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount $ 120,381,000      
Carrying Value 55,612,000 $ 129,765,000    
Valuation Allowance (Reversal) $ 3,826,000      
Loan Count | loan 4 4    
Weighted Average (as percent) 22.49% 22.42%    
Wtd Avg Coupon (as percent) 15.20%      
Weighted Average Life (Years) 6 months 6 days      
Floating Rate Loans as a % of Face Amount (as percent) 0.00%      
Delinquent Face Amount $ 59,384,000      
Residential Loans | Held-for-sale        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount 771,000      
Carrying Value 231,000 $ 532,000    
Valuation Allowance (Reversal) $ 213,000      
Loan Count | loan 3 4    
Weighted Average (as percent) 3.40% 62.02%    
Wtd Avg Coupon (as percent) 3.05%      
Weighted Average Life (Years) 1 year 10 months 6 days      
Floating Rate Loans as a % of Face Amount (as percent) 100.00%      
Delinquent Face Amount $ 628,000      
Subprime Mortgage Loans Subject to Call Option | Subprime        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding Face Amount 0      
Carrying Value $ 0 $ 380,806,000