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Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Australian Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6677 | 0.6663 | 0.6677 | 0.6663 | 0.6828
Australian Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6591 | 0.6681 | 0.6582 | 0.6761 | 0.6647
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6096 | 0.6133 | 0.6096 | 0.6133 | 0.6340
New Zealand Dollar [Member] | Average Rate [Member] |  |  |  |  |
Currency Exchange Rates [Line Items] |  |  |  |  |
Foreign currency exchange rate | 0.6054 | 0.6186 | 0.6089 | 0.6243 | 0.6145

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