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Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Australian Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6451 | 0.6437 | 0.6451 | 0.6437 | 0.6805
Australian Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6551 | 0.6829 | 0.6691 | 0.7071 | 0.6946
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6013 | 0.5642 | 0.6013 | 0.5642 | 0.6342
New Zealand Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6053 | 0.6127 | 0.6179 | 0.6463 | 0.6357

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