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Non-Agency MBS (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities [Table Text Block]
The following table presents the components of the Company’s non-Agency MBS as of December 31, 2012 and December 31, 2011:
 
December 31, 2012
 
RMBS
 
CMBS
 
CMBS IO (1)
 
Total
Principal/par value
$
11,411

 
$
463,747

 
$
—

 
$
475,158

Unamortized premium
—

 
2,520

 
108,928

 
111,448

Unamortized discount
(781
)
 
(19,833
)
 
—

 
(20,614
)
Amortized cost
10,630

 
446,434

 
108,928

 
565,992

Available for sale (recognized in statement of comprehensive income):
 
 
 
 
 
 
 
Gross unrealized gains
606

 
39,944

 
5,054

 
45,604

Gross unrealized losses
(198
)
 
(36
)
 
(40
)
 
(274
)
Fair value
$
11,038

 
$
486,342

 
$
113,942

 
$
611,322

Weighted average coupon
4.28
%
 
5.31
%
 
0.86
%
 
 
(1)
The notional balance for the non-Agency CMBS IO securities is $2,393,614 as of December 31, 2012.

 
December 31, 2011
 
RMBS
 
CMBS
 
CMBS IO (1)
 
Total
Principal/par value
$
17,119

 
$
359,853

 
$
—

 
$
376,972

Unamortized premium
—

 
3,646

 
51,239

 
54,885

Unamortized discount
(1,003
)
 
(17,511
)
 
—

 
(18,514
)
Amortized cost
16,116

 
345,988

 
51,239

 
413,343

Available for sale (recognized in statement of comprehensive income):
 
 
 
 
 
 
 
Gross unrealized gains
507

 
11,806

 
893

 
13,206

Gross unrealized losses
(1,353
)
 
(3,724
)
 
(376
)
 
(5,453
)
Fair value
$
15,270

 
$
354,070

 
$
51,756

 
$
421,096

Weighted average coupon
4.41
%
 
5.91
%
 
1.24
%
 
 
(1)
The notional balance for the non-Agency CMBS IO securities is $906,202 as of December 31, 2011.
Mortgage-backed Securities, Issued by Private Enterprises [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
The following table presents certain information for those non-Agency MBS that were in an unrealized loss position as of December 31, 2012 and December 31, 2011:
 
December 31, 2012
 
December 31, 2011
 
Fair Value
 
Unrealized Loss
 
# of Securities
 
Fair Value
 
Unrealized Loss
 
# of Securities
Unrealized loss position for:
 
 
 
 
 
 
 
 
 
 
 
Less than one year:
$
13,877

 
$
(76
)
 
3
 
$
153,974

 
$
(5,075
)
 
6
One year or more:
2,701

 
(198
)
 
8
 
2,993

 
(379
)
 
7
 
$
16,578

 
$
(274
)
 
11
 
$
156,967

 
$
(5,454
)
 
13