v3.19.1

Financial Derivatives (Schedule of Derivative Activity) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Interest rate swaps |  |
Derivative [Line Items] |  |
Average Monthly Notional | $ 912,934 | $ 1,059,756
TBAs |  |
Derivative [Line Items] |  |
Average Monthly Notional | 984,292 |
Credit default swaps |  |
Derivative [Line Items] |  |
Average Monthly Notional | 403,254 | 566,805
Total return swaps |  |
Derivative [Line Items] |  |
Average Monthly Notional | 38,400 | 53,603
Futures |  |
Derivative [Line Items] |  |
Average Monthly Notional | 280,947 | 201,295
Options |  |
Derivative [Line Items] |  |
Average Monthly Notional | 51,545 | 99,891
Forwards |  |
Derivative [Line Items] |  |
Average Monthly Notional | 29,078 | $ 45,522
Warrants |  |
Derivative [Line Items] |  |
Average Monthly Notional | $ 2,281 |

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