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Investments in Debt Securities Investments in Debt Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Available-for-sale [Table Text Block] | The following tables present the Company’s MBS by investment type (including securities pending settlement) as of the dates indicated:
| June 30, 2020 |  |  |  |  |  |  |  |  |  |
| Par |  | Net Premium (Discount) |  | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss |  | Fair Value
Agency RMBS | $ | 2,248,752 |  |  | $ | 67,589 |  |  | $ | 2,316,341 |  |  | $ | 40,465 |  |  | $ | — |  |  | $ | 2,356,806 |
Agency CMBS | 655,935 |  |  | 6,518 |  |  | 662,453 |  |  | 39,507 |  |  | (1) |  |  | 701,959 |
CMBS IO (1) | — |  |  | 435,271 |  |  | 435,271 |  |  | 5,731 |  |  | (4,332) |  |  | 436,670 |
Non-Agency other | 1,732 |  |  | (600) |  |  | 1,132 |  |  | 403 |  |  | (45) |  |  | 1,490 |
Total MBS: | $ | 2,906,419 |  |  | $ | 508,778 |  |  | $ | 3,415,197 |  |  | $ | 86,106 |  |  | $ | (4,378) |  |  | $ | 3,496,925 |
(1) The notional balance for Agency CMBS IO and non-Agency CMBS IO was $13,007,113 and $9,577,721 respectively, as of June 30, 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.
Schedule of Realized Gain (Loss) [Table Text Block] | The following table presents information regarding the "gain on sale of investments, net" on the Company’s consolidated statements of comprehensive income (loss) for the periods indicated:
| Three Months Ended |  |  |  |  |  |  |  | Six Months Ended |  |  |  |  |  |
| June 30, |  |  |  |  |  |  |  | June 30, |  |  |  |  |  |
| 2020 |  |  |  | 2019 |  |  |  | 2020 |  |  |  | 2019 |  |
| Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss) |  | Proceeds Received |  | Realized Gain (Loss)
Agency RMBS | $ | 371,106 |  |  | $ | 11,729 |  |  | $ | 205,493 |  |  | $ | (3,953) |  |  | $ | 2,188,456 |  |  | $ | 75,823 |  |  | $ | 205,493 |  |  | $ | (3,953) |
Agency CMBS | 2,020,228 |  |  | 181,370 |  |  | 213,198 |  |  | (6,493) |  |  | 2,193,912 |  |  | 202,059 |  |  | 213,198 |  |  | (6,493) |
Agency CMBS IO | — |  |  | — |  |  | 13,861 |  |  | 86 |  |  | — |  |  | — |  |  | 13,861 |  |  | 86 |
| $ | 2,391,334 |  |  | $ | 193,099 |  |  | $ | 432,552 |  |  | $ | (10,360) |  |  | $ | 4,382,368 |  |  | $ | 277,882 |  |  | $ | 432,552 |  |  | $ | (10,360) |
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value [Table Text Block] | The following table presents certain information for the AFS securities in an unrealized loss position as of the dates indicated:
| June 30, 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 | $ | 87,603 |  |  | $ | (2,304) |  |  | 26 |  | $ | 215,792 |  |  | $ | (1,139) |  |  | 27
Non-Agency MBS | 98,246 |  |  | (1,926) |  |  | 47 |  | 13,607 |  |  | (146) |  |  | 7
Continuous unrealized loss position for 12 months or longer: |  |  |  |  |  |  |  |  |  |  |
Agency MBS | $ | 1,225 |  |  | $ | (128) |  |  | 3 |  | $ | 75,745 |  |  | $ | (35) |  |  | 2
Non-Agency MBS | 107 |  |  | (20) |  |  | 4 |  | 1,099 |  |  | (31) |  |  | 5

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