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Investments in Debt Securities Investments in Debt Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Debt Securities, Available-for-sale [Table Text Block] | 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.
Schedule of Realized Gain (Loss) [Table Text Block] | 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) |
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:
| 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

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