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Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Australian Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.7009 | 0.7399 | 0.7009 | 0.7399 | 0.7046
Australian Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.7001 | 0.7569 | 0.7062 | 0.7715 | 0.7479
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6711 | 0.6773 | 0.6711 | 0.6773 | 0.6711
New Zealand Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6626 | 0.7046 | 0.6721 | 0.7161 | 0.6930

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