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Significant Accounting Policies (Exchange Rates) (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Canadian Dollar (CAD) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 1.2545 | 1.3427 |
Average Rates | 1.2981 | 1.3256 | 1.2786
Average Rates % Change | 2.10% | (3.70%) |
Euros (EUR) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 0.8334 | 0.9476 |
Average Rates | 0.8871 | 0.9041 | 0.9014
Average Rates % Change | 1.90% | (0.30%) |
Polish Zloty (PLN) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 3.4841 | 4.2065 |
Average Rates | 3.7764 | 3.9455 | 3.7706
Average Rates % Change | 4.30% | (4.60%) |
British Pound (GBP) [Member] |  |  |
Currency [Line Items] |  |  |
Ending rates | 0.7396 | 0.8106 |
Average Rates | 0.7767 | 0.7410 | 0.6545
Average Rates % Change | (4.80%) | (13.20%) |

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