Investment in Securities (Summary of Investment Income) (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
[1] | Sep. 30, 2019 |
Sep. 30, 2018 |
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| Securities, Available-for-sale [Line Items] | ||||||||
| Net Amortization | $ (35,130) | |||||||
| Interest Income | $ 39,985 | $ 35,300 | $ 114,548 | $ 95,333 | [1] | |||
| Agency RMBS | ||||||||
| Securities, Available-for-sale [Line Items] | ||||||||
| Coupon Interest | 16,026 | 42,681 | ||||||
| Net Amortization | (6,290) | (15,883) | ||||||
| Interest Income | 9,736 | 26,798 | ||||||
| Non-Agency RMBS and CMBS | ||||||||
| Securities, Available-for-sale [Line Items] | ||||||||
| Coupon Interest | 3,383 | 10,514 | ||||||
| Net Amortization | 430 | 1,666 | ||||||
| Interest Income | 3,813 | 12,180 | ||||||
| CLOs | ||||||||
| Securities, Available-for-sale [Line Items] | ||||||||
| Coupon Interest | 3,480 | 11,391 | ||||||
| Net Amortization | (627) | (1,138) | ||||||
| Interest Income | 2,853 | 10,253 | ||||||
| Other Securities | ||||||||
| Securities, Available-for-sale [Line Items] | ||||||||
| Coupon Interest | 1,670 | 4,706 | ||||||
| Net Amortization | (611) | (1,528) | ||||||
| Interest Income | 1,059 | 3,178 | ||||||
| Securities Investment [Member] | ||||||||
| Securities, Available-for-sale [Line Items] | ||||||||
| Coupon Interest | 24,559 | 69,292 | ||||||
| Net Amortization | (7,098) | (16,883) | ||||||
| Interest Income | $ 17,461 | $ 52,409 | ||||||
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