Annual report pursuant to Section 13 and 15(d)

REAL ESTATE SECURITIES (Narrative) (Details)

v3.6.0.2
REAL ESTATE SECURITIES (Narrative) (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
security
Oct. 31, 2016
USD ($)
security
Aug. 31, 2016
USD ($)
security
Jun. 30, 2016
USD ($)
May 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Investment [Line Items]                
OTTI recorded           $ 23,100,000 $ 2,400,000 $ 0
OTTI in other comprehensive income           0 100,000 0
Proceeds from sale of securities           2,777,808,000 1,425,480,000 798,580,000
Principal repayments from investments           $ 150,459,000 $ 128,191,000 $ 245,447,000
CMBS                
Investment [Line Items]                
Face amount of securities sold $ 10,300,000.0       $ 98,600,000      
Number of securities sold | security 2              
Proceeds from sale of securities $ 100,000       102,600,000      
Gain (Loss) 100,000       14,000,000      
Principal repayments from investments         $ 25,000,000      
Average price percentage - sold (as percent)         104.03%      
CDO                
Investment [Line Items]                
Face amount of securities sold   $ 39,600,000.0 $ 14,800,000.0 $ 10,000,000.0        
Number of securities sold | security   4 2          
Proceeds from sale of securities   $ 100,000 $ 9,900,000 700,000        
Gain (Loss)   $ 100,000 $ 9,900,000 700,000        
Principal amount on investment       $ 0        
Average price percentage - sold (as percent)     67.30% 7.25%        
ABS-Small Business Loans                
Investment [Line Items]                
Face amount of securities sold 8,500,000.0              
Proceeds from sale of securities 100,000              
Gain (Loss) $ 100,000              
May 2015 Sale 1 | ABS - Non-Agency RMBS                
Investment [Line Items]                
Face amount of securities sold         $ 42,800,000      
Proceeds from sale of securities         36,700,000      
Gain (Loss)         $ 14,100,000      
Average price percentage - sold (as percent)         85.54%      
May 2015 Sale 2 | ABS - Non-Agency RMBS                
Investment [Line Items]                
Face amount of securities sold         $ 3,900,000.0      
Proceeds from sale of securities         900,000      
Gain (Loss)         $ 800,000      
Average price percentage - sold (as percent)         24.11%