Operations In Foreign Currency (Summary Of Currency Exchange Rates) (Details) |
3 Months Ended | 9 Months Ended | 12 Months Ended | ||
---|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
Dec. 31, 2017 |
|
Australian Dollar [Member] | Spot Rate [Member] | |||||
Currency Exchange Rates [Line Items] | |||||
Foreign currency exchange rate | 0.7238 | 0.7238 | 0.7840 | 0.7840 | 0.7815 |
Australian Dollar [Member] | Average Rate [Member] | |||||
Currency Exchange Rates [Line Items] | |||||
Foreign currency exchange rate | 0.7311 | 0.7899 | 0.7580 | 0.7664 | 0.7670 |
New Zealand Dollar [Member] | Spot Rate [Member] | |||||
Currency Exchange Rates [Line Items] | |||||
Foreign currency exchange rate | 0.6635 | 0.6635 | 0.7225 | 0.7225 | 0.7100 |
New Zealand Dollar [Member] | Average Rate [Member] | |||||
Currency Exchange Rates [Line Items] | |||||
Foreign currency exchange rate | 0.6685 | 0.7307 | 0.7002 | 0.7159 | 0.7111 |