Annual report pursuant to Section 13 and 15(d)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Loans (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Loans (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Discount Rate (as percent) 12.00%
Loss Severity (as percent) 64.20%
Prepayment Speed (as percent) 3.90%
Constant Default Rate (as percent) 5.10%
Real Estate Related and other Loans  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value $ 55,612,000
Outstanding face amount 138,148,000
Real Estate Related and other Loans | Held-for-sale  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 55,612,000
Fair Value 61,144,000
Outstanding face amount 138,148,000
Real Estate Related and other Loans | Corporate Loans  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Outstanding face amount 45,700,000
Real Estate Related and other Loans | Corporate Loans | Held-for-sale  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 55,612,000
Fair Value $ 61,144,000
Discount Rate (as percent) 22.50%
Loss Severity (as percent) 49.30%
Outstanding face amount $ 120,381,000
Real Estate Related and other Loans | Corporate Loans | Lower Range  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Discount Rate (as percent) 0.00%
Loss Severity (as percent) 0.00%
Real Estate Related and other Loans | Corporate Loans | Upper Range  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Discount Rate (as percent) 22.50%
Loss Severity (as percent) 100.00%
Real Estate Related and other Loans | Mezzanine Loans  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value $ 0
Outstanding face amount 17,800,000
Real Estate Related and other Loans | Mezzanine Loans | Held-for-sale  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Carrying Value 0
Outstanding face amount $ 17,767,000