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Derivatives (Summary Of The Fair Value Of The Equity Index Put Options) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Option Indexed to Issuer's Equity [Line Items] |  |  |  |  |
Equity index put option liability | $ 8,374 |  | $ 8,374 |  | $ 11,958
Net derivative gain (loss) | 353 | $ 2,987 | 3,584 | $ 3,260 |
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 | 8,374 |  | 8,374 |  | $ 11,958
Net derivative gain (loss) | $ 353 | $ 2,987 | $ 3,584 | $ 3,260 |

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