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Agency MBS (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Agency MBS [Line Items]  
Agency MBS Schedule [Table Text Block]
The following table presents the components of the Company’s investment in Agency MBS as of December 31, 2012 and December 31, 2011:
 
December 31, 2012
 
RMBS
 
CMBS
 
CMBS IO (1)
 
Total
Principal/par value
$
2,425,826

 
$
306,527

 
$
—

 
$
2,732,353

Unamortized premium
137,181

 
23,517

 
550,171

 
710,869

Unamortized discount
(13
)
 
—

 
—

 
(13
)
Amortized cost
2,562,994

 
330,044

 
550,171

 
3,443,209

Available for sale (recognized in statement of comprehensive income):
 
 
 
 
 
 
 
Gross unrealized gains
19,477

 
21,570

 
18,218

 
59,265

Gross unrealized losses
(11,134
)
 
(6
)
 
(1,209
)
 
(12,349
)
Trading (recognized in income statement):
 
 
 
 
 
 


Gross unrealized gains
—

 
2,534

 
—

 
2,534

Total Agency MBS fair value:
$
2,571,337

 
$
354,142

 
$
567,180

 
$
3,492,659

Weighted average coupon
3.67
%
 
5.19
%
 
0.95
%
 
 
(1)
The combined notional balance for the Agency CMBS IO securities is $10,059,495 as of December 31, 2012.

 
December 31, 2011
 
RMBS
 
CMBS
 
CMBS IO (1)
 
Total
Principal/par value
$
1,488,397

 
$
266,952

 
$
—

 
$
1,755,349

Unamortized premium
85,488

 
21,627

 
86,358

 
193,473

Unamortized discount
(17
)
 
—

 
—

 
(17
)
Amortized cost
1,573,868

 
288,579

 
86,358

 
1,948,805

Available for sale (recognized in statement of comprehensive income):
 
 
 
 
 
 
 
Gross unrealized gains
10,787

 
11,746

 
350

 
22,883

Gross unrealized losses
(7,405
)
 
—

 
(1,043
)
 
(8,448
)
Trading (recognized in income statement):
 
 
 
 
 
 
 
Gross unrealized gains
—

 
1,919

 
—

 
1,919

Total Agency MBS fair value:
$
1,577,250

 
$
302,244

 
$
85,665

 
$
1,965,159

Weighted average coupon
4.54
%
 
5.20
%
 
0.96
%
 
 
(1)
The combined notional balance for the Agency CMBS IO securities is $1,813,096 as of December 31, 2011.
Agency MBS [Member]
  
Schedule of Agency MBS [Line Items]  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
The following table presents certain information for those Agency MBS 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
$
1,026,277

 
$
(6,552
)
 
83
 
$
680,101

 
$
(6,765
)
 
54
One year or more
271,719

 
(5,797
)
 
34
 
160,544

 
(1,684
)
 
27
 
$
1,297,996

 
$
(12,349
)
 
117
 
$
840,645

 
$
(8,449
)
 
81