| Schedule of Maturities of Long-term Debt [Table Text Block] |
The following table details the Company's principal repayment schedule for outstanding borrowings as of September 30, 2017: | | | | | | | | | | | | | | | | | | Year | | Reverse Repurchase Agreements | | Other Secured Borrowings | | Senior Notes(1) | | Total | 2017 | | $ | 936,105 |
| | $ | — |
| | $ | — |
| | $ | 936,105 |
| 2018 | | 93,705 |
| | 46,899 |
| | — |
| | 140,604 |
| 2019 | | — |
| | 42,747 |
| | — |
| | 42,747 |
| 2020 | | — |
| | — |
| | — |
| | — |
| 2021 | | — |
| | — |
| | — |
| | — |
| 2022 | | — |
| | — |
| | 86,000 |
| | 86,000 |
| Total | | $ | 1,029,810 |
| | $ | 89,646 |
| | $ | 86,000 |
| | $ | 1,205,456 |
|
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| Schedule of Repurchase Agreements [Table Text Block] |
The following table details the Company's outstanding borrowings under reverse repurchase agreements for Agency RMBS, Credit assets (which include non-Agency MBS, CLOs, consumer loans, corporate debt, and residential mortgage loans), and U.S. Treasury securities, by remaining maturity as of September 30, 2017 and December 31, 2016: | | | | | | | | | | | | | | | | | | | | | (In thousands) | | September 30, 2017 | | December 31, 2016 | | | | | Weighted Average | | | | Weighted Average | Remaining Maturity | | Outstanding Borrowings | | Interest Rate | | Remaining Days to Maturity | | Outstanding Borrowings | | Interest Rate | | Remaining Days to Maturity | Agency RMBS: | | | | | | | | | | | | | 30 Days or Less | | $ | 281,543 |
| | 1.28 | % | | 15 |
| | $ | 405,725 |
| | 0.83 | % | | 18 | 31-60 Days | | 263,601 |
| | 1.33 | % | | 44 |
| | 195,288 |
| | 0.94 | % | | 45 | 61-90 Days | | 184,448 |
| | 1.39 | % | | 75 |
| | 149,965 |
| | 0.97 | % | | 74 | 91-120 Days | | 38,826 |
| | 1.40 | % | | 103 |
| | 8,240 |
| | 0.83 | % | | 102 | 121-150 Days | | — |
| | — | % | | — |
| | 11,798 |
| | 0.96 | % | | 131 | 151-180 Days | | — |
| | — | % | | — |
| | 19,296 |
| | 1.05 | % | | 164 | Total Agency RMBS | | 768,418 |
| | 1.33 | % | | 43 |
| | 790,312 |
| | 0.89 | % | | 41 | Credit: | | | | | | | | | | | | | 30 Days or Less | | 64,719 |
| | 1.79 | % | | 7 |
| | 94,849 |
| | 2.55 | % | | 16 | 31-60 Days | | 83,826 |
| | 2.77 | % | | 47 |
| | 26,974 |
| | 2.36 | % | | 47 | 61-90 Days | | 52,247 |
| | 2.19 | % | | 72 |
| | 41,522 |
| | 2.43 | % | | 77 | 91-120 Days | | 34,783 |
| | 3.82 | % | | 103 |
| | 10,084 |
| | 2.91 | % | | 97 | 121-150 Days | | 3,338 |
| | 3.04 | % | | 126 |
| | 1,239 |
| | 2.73 | % | | 124 | 151-180 Days | | 8,991 |
| | 3.63 | % | | 164 |
| | 12,616 |
| | 3.17 | % | | 165 | 181-360 Days | | 7,768 |
| | 3.72 | % | | 234 |
| | 50,557 |
| | 3.46 | % | | 316 | Total Credit Assets | | 255,672 |
| | 2.61 | % | | 60 |
| | 237,841 |
| | 2.75 | % | | 105 | U.S. Treasury Securities: | | | | | | | | | | | | | 30 Days or Less | | 5,720 |
| | 1.30 | % | | 2 |
| | 5,428 |
| | 0.91 | % | | 4 | Total U.S. Treasury Securities | | 5,720 |
| | 1.30 | % | | 2 |
| | 5,428 |
| | 0.91 | % | | 4 | Total | | $ | 1,029,810 |
| | 1.65 | % | | 48 |
| | $ | 1,033,581 |
| | 1.32 | % | | 56 |
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