Quarterly report pursuant to Section 13 or 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)
 3 Months Ended
Mar. 31, 2017
USD ($)
loan
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Face Amount $ 141,579,000  
Carrying Value $ 59,043,000  
Loan Count (in loans) | loan 6  
Delinquent Face Amount $ 77,151,000  
Real Estate Related and Other Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Face Amount 141,579,000  
Carrying Value 59,043,000 $ 55,612,000
Real Estate Related and Other Loans | Held-for-sale    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Face Amount 141,579,000  
Carrying Value $ 59,043,000  
Loan Count (in loans) | loan 6  
Weighted Average Yield (as percent) 22.49%  
Weighted Average Coupon (as percent) 14.52%  
Weighted Average Life 6 months 1 day  
Floating Rate Loans as % of Face Amount (as percent) 12.50%  
Delinquent Face Amount $ 77,151,000  
Real Estate Related and Other Loans | Held-for-sale | Mezzanine Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Face Amount 17,767,000  
Carrying Value $ 0  
Loan Count (in loans) | loan 2  
Weighted Average Yield (as percent) 0.00%  
Weighted Average Coupon (as percent) 8.39%  
Weighted Average Life 6 days  
Floating Rate Loans as % of Face Amount (as percent) 100.00%  
Delinquent Face Amount $ 17,767,000  
Real Estate Related and Other Loans | Held-for-sale | Corporate Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Face Amount 123,812,000  
Carrying Value $ 59,043,000  
Loan Count (in loans) | loan 4  
Weighted Average Yield (as percent) 22.49%  
Weighted Average Coupon (as percent) 15.40%  
Weighted Average Life 6 months 1 day  
Floating Rate Loans as % of Face Amount (as percent) 0.00%  
Delinquent Face Amount $ 59,384,000  
Residential | Held-for-sale    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding Face Amount 769,000  
Carrying Value $ 228,000  
Loan Count (in loans) | loan 3  
Weighted Average Yield (as percent) 3.11%  
Weighted Average Coupon (as percent) 3.42%  
Weighted Average Life 5 months 1 day  
Floating Rate Loans as % of Face Amount (as percent) 100.00%  
Delinquent Face Amount $ 628,000  
Face amount of real estate related loans on non-accrual status $ 77,200,000