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Mortgage Backed Securities Mortgage backed securities (Notes)
 12 Months Ended
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]  
Mortgage-backed securities
MORTGAGE-BACKED SECURITIES
 
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.

The Company has investments in additional Agency CMBS not included in the tables above that are designated as trading securities by the Company with fair values of $28,717 and $30,069 as of December 31, 2013 and December 31, 2012, respectively. Changes in the fair value of these Agency CMBS are recognized each reporting period within "fair value adjustments, net" in the Company's consolidated statements of net income. As of December 31, 2013 and December 31, 2012, the amortized cost of these Agency CMBS designated as trading securities was $26,920 and $27,535, respectively. The Company recognized a net unrealized loss for the year ended December 31, 2013 of $(652) compared to a net unrealized gain of $735 for the year ended December 31, 2012, respectively, related to changes in fair value.
   
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


Because the principal and interest related to Agency MBS are guaranteed by the government-sponsored entities Fannie Mae and Freddie Mac who have the implicit guarantee of the U.S. government, the Company does not consider any of the unrealized losses on its Agency MBS to be credit related. Although the unrealized losses are not credit related, the Company assesses its ability and intent to hold any Agency MBS with an unrealized loss until the recovery in its value. This assessment is based on the amount of the unrealized loss and significance of the related investment as well as the Company’s current leverage and anticipated liquidity.  Based on this analysis, the Company has determined that the unrealized losses on its Agency MBS as of December 31, 2013 and December 31, 2012 were temporary.

The Company also reviews any non-Agency MBS in an unrealized loss position to evaluate whether any decline in fair value represents an other-than-temporary impairment. The evaluation includes a review of the credit ratings of these non-Agency MBS and the seasoning of the mortgage loans collateralizing these securities as well as the estimated future cash flows which include projected losses. The Company performed this evaluation for the non-Agency MBS in an unrealized loss position and has determined that there have not been any adverse changes in the timing or amount of estimated future cash flows that necessitate a recognition of other-than-temporary impairment amounts as of December 31, 2013 or December 31, 2012.