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Significant Accounting Policies (Schedule Of Exchange Rates To US Dollar) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Canadian Dollar (CAD) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 1.3642 | 1.2545 |
Average Rates | 1.2960 | 1.2981 | 1.3256
Average Rates % Change | 0.20% | 2.10% |
Euros (EUR) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 0.8738 | 0.8334 |
Average Rates | 0.8473 | 0.8871 | 0.9041
Average Rates % Change | 4.50% | 1.90% |
Polish Zloty (PLN) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 3.7606 | 3.4841 |
Average Rates | 3.6103 | 3.7764 | 3.9455
Average Rates % Change | 4.40% | 4.30% |
British Pound (GBP) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 0.7823 | 0.7396 |
Average Rates | 0.7497 | 0.7767 | 0.7410
Average Rates % Change | 3.50% | (4.80%) |

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