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Derivatives (Summary Of The Fair Value Of The Equity Index Put Options) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Option Indexed to Issuer's Equity [Line Items] |  |  |
Equity index put option liability | $ 8,727 |  | $ 11,958
Net derivative gain (loss) | 3,231 | $ 273 |
Equity Index Put Option Contracts [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Equity index put option liability | 8,727 |  | $ 11,958
Net derivative gain (loss) | $ 3,231 | $ 273 |

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