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Basis of Presentation and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Basis of Presentation and Significant Accounting Policies [Abstract]  
Gains and Losses on Sale of Specified Categories of Investments
The following table presents gains and losses on sales of the specified categories of investments for the periods indicated (dollars in thousands):

  
Year Ended December 31,
 
  
2018
  
2017
  
2016
 
Realized gain (loss) on RMBS, net
         
Gain on RMBS
 
$
104
  
$
213
  
$
1,572
 
Loss on RMBS
  
(8,466
)
  
(716
)
  
(173
)
Net realized gain (loss) on RMBS
  
(8,362
)
  
(503
)
  
1,399
 
Realized loss on derivatives, net
  
(5,889
)
  
(5,554
)
  
(7,963
)
Unrealized gain on derivatives, net
  
3,505
   
6,580
   
12,080
 
Realized gain on Excess MSRs, net
  
-
   
6,678
   
1,520
 
Unrealized gain on Excess MSRs, net
  
-
   
-
   
249
 
Unrealized gain (loss) on MSRs, net
  
(3,573
)
  
9,159
   
(3,285
)
Total
 
$
(14,319
)
 
$
16,360
  
$
4,000