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To Be Announced RMBS (Tables)
 12 Months Ended
Dec. 31, 2017
To Be Announced RMBS [Abstract]  
To Be Announced RMBS [Table Text Block]
The below table details TBA assets, liabilities, and the respective related payables and receivables as of December 31, 2017 and 2016:
 
 
As of
 
 
December 31, 2017
 
December 31, 2016
Assets:
 
(In thousands)
TBA securities, at fair value (Current principal: $118,806 and $67,720, respectively)
 
$
123,680

 
$
70,525

Receivable for securities sold relating to unsettled TBA sales
 
460,666

 
406,708

Liabilities:
 
 
 
 
TBA securities sold short, at fair value (Current principal: -$442,197 and -$384,155, respectively)
 
$
(460,189
)
 
$
(404,728
)
Payable for securities purchased relating to unsettled TBA purchases
 
(123,918
)
 
(70,347
)
Net short TBA securities, at fair value
 
(336,509
)
 
(334,203
)