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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