Annual report pursuant to Section 13 and 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental non-cash investing and financing activities relating to CDOS (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Supplemental non-cash investing and financing activities relating to CDOS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Variable Interest Entity [Line Items]      
Restricted cash generated from sale of securities $ 0 $ 139,257  
Restricted cash generated from sale of loans 0 55,574  
Restricted cash generated from pay downs on securities and loans 2,310 78,853  
Restricted cash used for repayments of CDO and other bonds payable 2,748 148,966  
CDO VI deconsolidation:      
Restricted cash 6,400   $ 6,000
CDO VI | VIEs      
CDO VI deconsolidation:      
Real estate securities 43,889 0  
Restricted cash   0 $ 67
CDO and other bonds payable $ 105,423 $ 0