v3.20.1

Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Interest rate swaps |  |
Derivative [Line Items] |  |
Average Monthly Notional | $ 1,194,366 | $ 731,941
TBA securities |  |
Derivative [Line Items] |  |
Average Monthly Notional | 969,311 | 973,331
Credit default swaps |  |
Derivative [Line Items] |  |
Average Monthly Notional | 328,023 | 399,316
Total return swaps |  |
Derivative [Line Items] |  |
Average Monthly Notional | 12,626 | 39,434
Futures |  |
Derivative [Line Items] |  |
Average Monthly Notional | 110,200 | 167,708
Options |  |
Derivative [Line Items] |  |
Average Monthly Notional | 4,876 | 19,825
Forwards |  |
Derivative [Line Items] |  |
Average Monthly Notional | 35,847 | 30,930
Warrants |  |
Derivative [Line Items] |  |
Average Monthly Notional | $ 1,538 | $ 2,222

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