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Mortgage Backed Securities Mortgage backed securities (Notes)
 12 Months Ended
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]  
Mortgage-backed securities
MORTGAGE-BACKED SECURITIES
 
The majority of the Company's MBS are pledged as collateral to cover initial and variation margins for the Company's repurchase agreements and derivative instruments. The following tables provide detail by type of investment for the Company’s MBS designated as AFS for the periods indicated:
 
December 31, 2014
 
Par
 
Net Premium (Discount)
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
 
WAC (1)
RMBS:
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
$
2,086,807

 
$
113,635

 
$
2,200,442

 
$
8,473

 
$
(22,215
)
 
$
2,186,700

 
3.09
%
Non-Agency
22,432

 
(17
)
 
22,415

 
107

 
(74
)
 
22,448

 
3.83
%
 
2,109,239

 
113,618

 
2,222,857

 
8,580

 
(22,289
)
 
2,209,148

 
 
CMBS:
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
301,943

 
18,042

 
319,985

 
15,288

 
(76
)
 
335,197

 
5.21
%
Non-Agency
210,358

 
(8,520
)
 
201,838

 
6,679

 
(479
)
 
208,038

 
4.33
%
 
512,301

 
9,522

 
521,823

 
21,967

 
(555
)
 
543,235

 
 
CMBS IO (2):
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
—

 
426,564

 
426,564

 
12,252

 
(79
)
 
438,737

 
0.80
%
Non-Agency
—

 
319,280

 
319,280

 
6,069

 
(230
)
 
325,119

 
0.72
%
 
—

 
745,844

 
745,844

 
18,321

 
(309
)
 
763,856

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 


Total AFS securities:
$
2,621,540

 
$
868,984

 
$
3,490,524

 
$
48,868

 
$
(23,153
)
 
$
3,516,239

 
 
(1)
The current weighted average coupon ("WAC") is the gross interest rate of the pool of mortgages underlying the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
(2)
The notional balance for Agency CMBS IO and non-Agency CMBS IO was $10,460,113 and $7,868,896, respectively, as of December 31, 2014.
 
December 31, 2013
 
Par
 
Net Premium (Discount)
 
Amortized Cost
 
Gross Unrealized Gain
 
Gross Unrealized Loss
 
Fair Value
 
WAC (1)
RMBS:
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
$
2,591,568

 
$
154,220

 
$
2,745,788

 
$
6,104

 
$
(59,742
)
 
$
2,692,150

 
3.22
%
Non-Agency
13,845

 
(338
)
 
13,507

 
338

 
(80
)
 
13,765

 
4.61
%
 
2,605,413

 
153,882

 
2,759,295

 
6,442

 
(59,822
)
 
2,705,915

 
 
CMBS:
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency (2)
273,830

 
19,061

 
292,891

 
10,793

 
(900
)
 
302,784

 
5.07
%
Non-Agency
375,703

 
(18,277
)
 
357,426

 
15,366

 
(3,511
)
 
369,281

 
5.10
%
 
649,533

 
784

 
650,317

 
26,159

 
(4,411
)
 
672,065

 
 
CMBS IO (3):
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
—

 
453,766

 
453,766

 
9,895

 
(3,334
)
 
460,327

 
0.83
%
Non-Agency
—

 
150,518

 
150,518

 
2,618

 
(1,999
)
 
151,137

 
0.66
%
 
—

 
604,284

 
604,284

 
12,513

 
(5,333
)
 
611,464

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total AFS securities:
$
3,254,946

 
$
758,950

 
$
4,013,896

 
$
45,114

 
$
(69,566
)
 
$
3,989,444

 


 
 
 
 
 
 
 
 
 
 
 
 
 
 

(1)
The current weighted average coupon ("WAC") is the gross interest rate of the pool of mortgages underlying the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
(2)
As of December 31, 2013, the Company had Agency CMBS with an amortized cost of $26,920 and fair value of $28,717 which were designated as trading securities and are not included in this table. The Company changed the designation of these Agency CMBS to AFS during the three months ended June 30, 2014. Changes in the fair value of these MBS while they were designated as trading were recognized in net income within "fair value adjustments, net". Changes in the fair value of these MBS, which are now designated as AFS, are recognized in "other comprehensive income". As of December 31, 2014, the Company does not have any MBS designated as trading.
(3)
The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $10,160,502 and $4,274,957, respectively, as of December 31, 2013.

The Company received proceeds of $503,918, $357,892, and $125,108 for the sale of MBS during the years ended December 31, 2014, December 31, 2013, and December 31, 2012, respectively. The following table presents the gross realized gains (losses) of those sales included in "gain on sale of investments, net" on the Company's consolidated statements of comprehensive income for the periods indicated:
 
Year Ended
 
December 31,
 
2014
 
2013
 
2012 (1)
($ in thousands)
Gain (Loss) Recognized
 
Gain (Loss) Recognized
 
Gain (Loss) Recognized
Gross realized gains on sales of MBS
$
22,492

 
$
8,670

 
$
5,319

Gross realized losses on sales of MBS
(6,269
)
 
(5,316
)
 
—

Total included in gain on sale of investments, net
$
16,223

 
$
3,354

 
$
5,319

(1)
Total gain on sale of investments, net for the year ended December 31, 2012 includes $2,072 and $1,070 of gains recognized from the Company's liquidation of a securitized mortgage loan and an investment in Freddie Mac Unsecured Senior Notes, respectively, which are not included in this table.

The following table presents certain information for those Agency MBS in an unrealized loss position as of December 31, 2014 and December 31, 2013:
 
December 31, 2014
 
December 31, 2013
 
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
$
322,741

 
$
(879
)
 
24
 
$
1,912,937

 
$
(43,543
)
 
150
Non-Agency MBS
111,778

 
(625
)
 
24
 
162,558

 
(5,435
)
 
39
 
 
 
 
 
 
 
 
 
 
 
 
Continuous unrealized loss position for 12 months or longer:
 
 
 
 
 
 
 
 
 
 
 
Agency MBS
$
1,321,323

 
$
(21,491
)
 
113
 
$
670,402

 
$
(20,433
)
 
67
Non-Agency MBS
18,037

 
(159
)
 
5
 
6,310

 
(155
)
 
6


Because the principal related to Agency MBS are guaranteed by the government-sponsored entities Fannie Mae and Freddie Mac which 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, 2014 and December 31, 2013 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 OTTI. 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 OTTI amounts as of December 31, 2014 or December 31, 2013.