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Investments in Debt Securities Investment in Debt Securities (Notes) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Mortgage-Backed Securities | MORTGAGE-BACKED SECURITIES The majority of the Company’s MBS are pledged as collateral for the Company’s repurchase agreements. The following tables present the Company’s MBS by investment type (including securities pending settlement) as of the dates indicated:
| December 31, 2020
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Agency RMBS | $ | 1,839,046 |  |  | $ | 57,997 |  |  | $ | 1,897,043 |  |  | $ | 49,348 |  |  | $ | — |  |  | $ | 1,946,391 |
Agency CMBS | 235,801 |  |  | 3,152 |  |  | 238,953 |  |  | 19,597 |  |  | — |  |  | 258,550 |
CMBS IO (1) | — |  |  | 378,940 |  |  | 378,940 |  |  | 12,081 |  |  | (982) |  |  | 390,039 |
Non-Agency other | 1,499 |  |  | (440) |  |  | 1,059 |  |  | 267 |  |  | (51) |  |  | 1,275 |
Total MBS: | $ | 2,076,346 |  |  | $ | 439,649 |  |  | $ | 2,515,995 |  |  | $ | 81,293 |  |  | $ | (1,033) |  |  | $ | 2,596,255 |
(1) The notional balance for Agency CMBS IO and non-Agency CMBS IO was $11,277,908 and $9,319,520 respectively, as of December 31, 2020.
| December 31, 2019
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Agency RMBS | $ | 2,563,684 |  |  | $ | 55,770 |  |  | $ | 2,619,454 |  |  | $ | 69,082 |  |  | $ | (462) |  |  | $ | 2,688,074 |
Agency CMBS | 1,890,186 |  |  | 15,414 |  |  | 1,905,600 |  |  | 93,763 |  |  | (6) |  |  | 1,999,357 |
CMBS IO (1) | — |  |  | 488,145 |  |  | 488,145 |  |  | 11,760 |  |  | (863) |  |  | 499,042 |
Non-Agency other | 1,938 |  |  | (780) |  |  | 1,158 |  |  | 552 |  |  | (20) |  |  | 1,690 |
Total MBS: | $ | 4,455,808 |  |  | $ | 558,549 |  |  | $ | 5,014,357 |  |  | $ | 175,157 |  |  | $ | (1,351) |  |  | $ | 5,188,163 |
(1) The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $13,404,824 and $9,799,629, respectively, as of December 31, 2019. 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 presents information regarding the "gain (loss) on sale of investments, net" on the Company’s consolidated statements of comprehensive income (loss) for the periods indicated:
| Year Ended
| December 31,
| 2020 |  | 2019 |  | 2018
| Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss)
Agency RMBS | $ | 2,395,032 |  |  | $ | 82,689 |  |  | $ | 796,699 |  |  | $ | 506 |  |  | $ | 217,837 |  |  | $ | (7,785) |
Agency CMBS | 2,247,273 |  |  | 225,395 |  |  | 213,199 |  |  | (6,493) |  |  | 242,029 |  |  | (9,218) |
Agency CMBS IO | — |  |  | — |  |  | 23,168 |  |  | 232 |  |  | 15,700 |  |  | 146 |
Non-Agency CMBS IO | — |  |  | — |  |  | — |  |  | — |  |  | 8,695 |  |  | 51 |
U.S. Treasuries | — |  |  | — |  |  | — |  |  | — |  |  | 248,803 |  |  | (6,567) |
| $ | 4,642,305 |  |  | $ | 308,084 |  |  | $ | 1,033,066 |  |  | $ | (5,755) |  |  | $ | 733,064 |  |  | $ | (23,373) |
The following table presents certain information for the AFS securities in an unrealized loss position as of the dates indicated:
| December 31, 2020 |  | December 31, 2019
| 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 | $ | 19,266 |  |  | $ | (399) |  |  | 19 |  | $ | 215,792 |  |  | $ | (1,139) |  |  | 27
Non-Agency MBS | 33,417 |  |  | (408) |  |  | 23 |  | 13,607 |  |  | (146) |  |  | 7
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 749 |  |  | $ | (133) |  |  | 2 |  | $ | 75,745 |  |  | $ | (35) |  |  | 2
Non-Agency MBS | 2,156 |  |  | (93) |  |  | 5 |  | 1,099 |  |  | (31) |  |  | 5
The unrealized losses on the Company’s MBS were the result of declines in market prices and were not credit related; therefore the Company’s allowance for credit losses on its MBS designated as available-for-sale was $0 as of December 31, 2020. The principal related to Agency MBS is guaranteed by the GSEs Fannie Mae and Freddie Mac. Although the unrealized losses are not credit related, the Company assesses its ability and intent to hold any 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. In addition, for its non-Agency MBS, the Company reviews the credit ratings, the credit characteristics of the mortgage loans collateralizing these securities, and the estimated future cash flows including projected collateral losses.

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