Financial Derivatives (Narrative) (Details) - USD ($) $ in Thousands |
Sep. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Derivative [Line Items] | ||
| Written credit derivative spread threshold | 20.00% | 20.00% |
| Credit Default Swap, Selling Protection [Member] | ||
| Derivative [Line Items] | ||
| Credit risk derivative in excess of threshold, at fair value, net | $ (39) | $ (100) |
| Minimum | ||
| Derivative [Line Items] | ||
| Spread on written credit derivatives | 11.03% | 4.00% |
| Upfront points on written credit derivative in excess of threshold | 55.4 | 56.2 |
| Maximum | ||
| Derivative [Line Items] | ||
| Spread on written credit derivatives | 14.77% | 27.48% |
| Upfront points on written credit derivative in excess of threshold | 85.2 | 85.2 |