Investment in Securities (Summary of Investment Income) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2021 |
|
| Securities, Available-for-sale [Line Items] | ||||
| Interest Income | $ 78,592 | $ 40,146 | $ 192,388 | $ 126,115 |
| Level 3 | ||||
| Securities, Available-for-sale [Line Items] | ||||
| Assets, Transfers into Level 3 | 8,207 | 11,040 | 35,984 | 12,922 |
| Agency RMBS | ||||
| Securities, Available-for-sale [Line Items] | ||||
| Coupon Interest | 11,950 | 14,797 | 39,227 | 43,449 |
| Net Amortization | (1,169) | (9,551) | (9,199) | (20,123) |
| Interest Income | 10,781 | 5,246 | 30,028 | 23,326 |
| Non-Agency RMBS and CMBS | ||||
| Securities, Available-for-sale [Line Items] | ||||
| Coupon Interest | 5,020 | 3,307 | 13,878 | 10,321 |
| Net Amortization | (52) | 748 | 79 | 3,179 |
| Interest Income | 4,968 | 4,055 | 13,957 | 13,500 |
| CLOs | ||||
| Securities, Available-for-sale [Line Items] | ||||
| Coupon Interest | 1,523 | 3,532 | 5,139 | 7,978 |
| Net Amortization | (595) | (1,456) | (1,800) | 59 |
| Interest Income | 928 | 2,076 | 3,339 | 8,037 |
| Other Securities | ||||
| Securities, Available-for-sale [Line Items] | ||||
| Coupon Interest | 5,473 | 4,590 | 15,616 | 12,296 |
| Net Amortization | (2,377) | (1,813) | (4,525) | (3,796) |
| Interest Income | 3,096 | 2,777 | 11,091 | 8,500 |
| Securities Investment [Member] | ||||
| Securities, Available-for-sale [Line Items] | ||||
| Coupon Interest | 23,966 | 26,226 | 73,860 | 74,044 |
| Net Amortization | (4,193) | (12,072) | (15,445) | (20,681) |
| Interest Income | $ 19,773 | $ 14,154 | $ 58,415 | $ 53,363 |