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Investments in Debt Securities (Notes) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Investments in Debt Securities | INVESTMENTS IN DEBT SECURITIES The majority of the Company’s debt securities are pledged as collateral for the Company’s repurchase agreements. The following tables present the Company’s debt securities by investment type as of the dates indicated:
| December 31, 2017
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC (1)
RMBS: |  |  |  |  |  |  |  |  |  |  |  |  |
Agency (2) | $ | 1,146,553 |  |  | $ | 46,021 |  |  | $ | 1,192,574 |  |  | $ | 1,626 |  |  | $ | (9,939 | ) |  | $ | 1,184,261 |  |  | 3.56 | %
Non-Agency | 1,070 |  |  | — |  |  | 1,070 |  |  | 41 |  |  | (20 | ) |  | 1,091 |  |  | 6.75 | %
| 1,147,623 |  |  | 46,021 |  |  | 1,193,644 |  |  | 1,667 |  |  | (9,959 | ) |  | 1,185,352 |  |  |
CMBS: |  |  |  |  |  |  |  |  |  |  |  |  |
Agency | 1,123,967 |  |  | 10,442 |  |  | 1,134,409 |  |  | 3,514 |  |  | (13,572 | ) |  | 1,124,351 |  |  | 3.03 | %
Non-Agency | 26,501 |  |  | (4,035 | ) |  | 22,466 |  |  | 2,298 |  |  | — |  |  | 24,764 |  |  | 5.47 | %
| 1,150,468 |  |  | 6,407 |  |  | 1,156,875 |  |  | 5,812 |  |  | (13,572 | ) |  | 1,149,115 |  |  |
CMBS IO (3): |  |  |  |  |  |  |  |  |  |  |  |  |
Agency | — |  |  | 375,361 |  |  | 375,361 |  |  | 5,238 |  |  | (293 | ) |  | 380,306 |  |  | 0.62 | %
Non-Agency | — |  |  | 308,472 |  |  | 308,472 |  |  | 4,468 |  |  | (724 | ) |  | 312,216 |  |  | 0.61 | %
| — |  |  | 683,833 |  |  | 683,833 |  |  | 9,706 |  |  | (1,017 | ) |  | 692,522 |  |  |
U.S. Treasuries: | 148,400 |  |  | (133 | ) |  | 148,267 |  |  | — |  |  | (1,737 | ) |  | 146,530 |  |  | 2.13 | %
Total AFS securities: | $ | 2,446,491 |  |  | $ | 736,128 |  |  | $ | 3,182,619 |  |  | $ | 17,185 |  |  | $ | (26,285 | ) |  | $ | 3,173,519 |  |  |
(1) | The weighted average coupon (“WAC”) is the gross interest rate of the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
(2) | Includes purchased securities pending settlement.
(3) | The notional balance for Agency CMBS IO and non-Agency CMBS IO was $14,196,122 and $11,006,463, respectively, as of December 31, 2017.
| December 31, 2016
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value |  | WAC (1)
RMBS: |  |  |  |  |  |  |  |  |  |  |  |  |
Agency | $ | 1,157,258 |  |  | $ | 57,066 |  |  | $ | 1,214,324 |  |  | $ | 2,832 |  |  | $ | (15,951 | ) |  | $ | 1,201,205 |  |  | 3.05 | %
Non-Agency | 33,572 |  |  | (24 | ) |  | 33,548 |  |  | 64 |  |  | (50 | ) |  | 33,562 |  |  | 3.58 | %
| 1,190,830 |  |  | 57,042 |  |  | 1,247,872 |  |  | 2,896 |  |  | (16,001 | ) |  | 1,234,767 |  |  |
CMBS: |  |  |  |  |  |  |  |  |  |  |  |  |
Agency | 1,152,586 |  |  | 13,868 |  |  | 1,166,454 |  |  | 6,209 |  |  | (28,108 | ) |  | 1,144,555 |  |  | 3.12 | %
Non-Agency | 79,467 |  |  | (6,718 | ) |  | 72,749 |  |  | 5,467 |  |  | — |  |  | 78,216 |  |  | 4.72 | %
| 1,232,053 |  |  | 7,150 |  |  | 1,239,203 |  |  | 11,676 |  |  | (28,108 | ) |  | 1,222,771 |  |  |
CMBS IO (2): |  |  |  |  |  |  |  |  |  |  |  |  |
Agency | — |  |  | 411,737 |  |  | 411,737 |  |  | 3,523 |  |  | (3,362 | ) |  | 411,898 |  |  | 0.67 | %
Non-Agency | — |  |  | 346,155 |  |  | 346,155 |  |  | 1,548 |  |  | (5,055 | ) |  | 342,648 |  |  | 0.61 | %
| — |  |  | 757,892 |  |  | 757,892 |  |  | 5,071 |  |  | (8,417 | ) |  | 754,546 |  |  |
Total AFS securities: | $ | 2,422,883 |  |  | $ | 822,084 |  |  | $ | 3,244,967 |  |  | $ | 19,643 |  |  | $ | (52,526 | ) |  | $ | 3,212,084 |  |  |  |
(1) | The WAC is the gross interest rate of the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
(2) | The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $13,106,912 and $10,884,964, respectively, as of December 31, 2016.
Actual maturities of MBS are affected by the contractual lives of the underlying mortgage collateral, periodic payments of principal, prepayments of principal, and the payment priority structure of the security; therefore, actual maturities are generally shorter than the securities' stated contractual maturities. The following table categorizes the Company’s debt securities according to their stated maturity as of the periods indicated:
|  | December 31, 2017 |  | December 31, 2016
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Less than 1 year |  | $ | 4,480 |  |  | $ | 4,542 |  |  | $ | 12,375 |  |  | $ | 12,189 |
>1 and <5 years |  | 208,046 |  |  | 210,727 |  |  | 228,443 |  |  | 235,059 |
>5 and <10 years |  | 1,334,795 |  |  | 1,326,178 |  |  | 1,060,273 |  |  | 1,040,609 |
> 10 years |  | 1,635,298 |  |  | 1,632,072 |  |  | 1,943,876 |  |  | 1,924,227 |
|  | $ | 3,182,619 |  |  | $ | 3,173,519 |  |  | $ | 3,244,967 |  |  | $ | 3,212,084 |
The Company reallocated capital during the year ended December 31, 2017 from adjustable rate investments with shorter duration into fixed rate investments with longer duration. The following table presents information regarding the sales included in “loss on sale of investments, net” on the Company’s consolidated statements of comprehensive income for the periods indicated:
| Year Ended
| December 31,
| 2017 |  | 2016 |  | 2015
| Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss)
Agency RMBS | $ | 716,560 |  |  | $ | (12,392 | ) |  | $ | 54,178 |  |  | $ | (3,010 | ) |  | $ | 174,565 |  |  | $ | (2,865 | )
Agency CMBS | 252,624 |  |  | (135 | ) |  | — |  |  | — |  |  | 149,360 |  |  | (604 | )
Non-Agency CMBS | 35,705 |  |  | 1,199 |  |  | 33,640 |  |  | (1,228 | ) |  | 30,775 |  |  | (566 | )
Non-Agency RMBS | 16,407 |  |  | 42 |  |  | — |  |  | — |  |  | — |  |  | — |
Agency CMBS IO | — |  |  | — |  |  | — |  |  | — |  |  | 45,096 |  |  | 1,698 |
Non-Agency CMBS IO | — |  |  | — |  |  | — |  |  | — |  |  | 50,125 |  |  | 1,359 |
U.S. Treasuries | 51,797 |  |  | (244 | ) |  | — |  |  | — |  |  | — |  |  | — |
| $ | 1,073,093 |  |  | $ | (11,530 | ) |  | $ | 87,818 |  |  | $ | (4,238 | ) |  | $ | 449,921 |  |  | $ | (978 | )
The following table presents certain information for those MBS in an unrealized loss position as of the dates indicated:
| December 31, 2017 |  | December 31, 2016
| 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 | $ | 1,293,798 |  |  | $ | (9,769 | ) |  | 71 |  | $ | 1,738,094 |  |  | $ | (38,469 | ) |  | 133
Non-Agency MBS | 51,406 |  |  | (421 | ) |  | 11 |  | 205,484 |  |  | (2,773 | ) |  | 48
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 423,698 |  |  | $ | (14,035 | ) |  | 30 |  | $ | 427,405 |  |  | $ | (8,952 | ) |  | 72
Non-Agency MBS | 20,414 |  |  | (323 | ) |  | 12 |  | 81,660 |  |  | (2,332 | ) |  | 26
Because the principal related to Agency MBS is 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 in accordance with GAAP. This assessment is based on the amount of the unrealized loss and significance of the related investment as well as the Company’s leverage and liquidity position. Based on this analysis, the Company has determined that the unrealized losses on its Agency MBS as of December 31, 2017 and December 31, 2016 were temporary. The Company 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 the non-Agency MBS, the credit characteristics of the mortgage loans collateralizing these securities, and the estimated future cash flows including projected collateral losses. The Company performed this evaluation for its 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, 2017 or December 31, 2016.

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