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Mortgage Backed Securities Mortgage backed securities (Tables)
 12 Months Ended
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]  
Available-for-sale Securities [Table Text Block]
The following table presents the components and weighted average coupon ("WAC") for the portion of the Company’s MBS designated as AFS as of December 31, 2013 and December 31, 2012:
 
December 31, 2013
 
Par
 
Net Premium (Discount)
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
 
WAC
Agency:
 
 
 
 
 
 
 
 
 
 
 
 
 
RMBS
$
2,591,568

 
$
154,220

 
$
2,745,788

 
$
6,104

 
$
(59,742
)
 
$
2,692,150

 
3.22
%
CMBS
273,830

 
19,061

 
292,891

 
10,793

 
(900
)
 
302,784

 
5.07
%
CMBS IO (1)
—

 
453,766

 
453,766

 
9,895

 
(3,334
)
 
460,327

 
0.83
%
Total Agency AFS:
2,865,398

 
627,047

 
3,492,445

 
26,792

 
(63,976
)
 
3,455,261

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-Agency:
 
 
 
 
 
 
 
 
 
 
 
 
 
RMBS
13,845

 
(338
)
 
13,507

 
338

 
(80
)
 
13,765

 
4.61
%
CMBS
375,703

 
(18,277
)
 
357,426

 
15,366

 
(3,511
)
 
369,281

 
5.10
%
CMBS IO (1)
—

 
150,518

 
150,518

 
2,618

 
(1,999
)
 
151,137

 
0.66
%
Total non-Agency AFS:
389,548

 
131,903

 
521,451

 
18,322

 
(5,590
)
 
534,183

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total AFS securities
$
3,254,946

 
$
758,950

 
$
4,013,896

 
$
45,114

 
$
(69,566
)
 
$
3,989,444

 
 
(1)
The notional balance for Agency CMBS IO and non-Agency CMBS IO is $10,160,502 and $4,274,957, respectively, as of December 31, 2013.

 
December 31, 2012
 
Par
 
Net Premium (Discount)
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
 
WAC
Agency:
 
 
 
 
 
 
 
 
 
 
 
 
 
RMBS
$
2,425,826

 
$
137,168

 
$
2,562,994

 
$
19,477

 
$
(11,134
)
 
$
2,571,337

 
3.67
%
CMBS
280,602

 
21,907

 
302,509

 
21,570

 
(6
)
 
324,073

 
5.19
%
CMBS IO (1)
—

 
550,171

 
550,171

 
18,218

 
(1,209
)
 
567,180

 
0.95
%
Total Agency AFS:
2,706,428

 
709,246

 
3,415,674

 
59,265

 
(12,349
)
 
3,462,590

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Non-Agency:
 
 
 
 
 
 
 
 
 
 
 
 
 
RMBS
11,411

 
(781
)
 
10,630

 
606

 
(198
)
 
11,038

 
4.28
%
CMBS
463,747

 
(17,313
)
 
446,434

 
39,944

 
(36
)
 
486,342

 
5.31
%
CMBS IO (1)
—

 
108,928

 
108,928

 
5,054

 
(40
)
 
113,942

 
0.86
%
Total non-Agency AFS:
475,158

 
90,834

 
565,992

 
45,604

 
(274
)
 
611,322

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total AFS securities
$
3,181,586

 
$
800,080

 
$
3,981,666

 
$
104,869

 
$
(12,623
)
 
$
4,073,912

 
 
(1)
The notional balance for the Agency CMBS IO and non-Agency CMBS IO is $10,059,495 and $2,393,614, respectively, as of December 31, 2012.
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, 2013 and December 31, 2012:
 
December 31, 2013
 
December 31, 2012
 
Fair Value
 
Gross Unrealized Losses
 
# of Securities
 
Fair Value
 
Gross Unrealized Losses
 
# of Securities
Continuous unrealized loss position for less than 12 months:
 
 
 
 
 
 
 
 
 
 
 
Agency MBS
$
1,912,937

 
$
(43,543
)
 
150
 
$
1,026,277

 
$
(6,552
)
 
83
Non-Agency MBS
162,558

 
(5,435
)
 
39
 
13,877

 
(76
)
 
3
 
 
 
 
 
 
 
 
 
 
 
 
Continuous unrealized loss position for 12 months or longer:
 
 
 
 
 
 
 
 
 
 
 
Agency MBS
$
670,402

 
$
(20,433
)
 
67
 
$
271,719

 
$
(5,797
)
 
34
Non-Agency MBS
6,310

 
(155
)
 
6
 
2,701

 
(198
)
 
8