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Operation in Foreign Currency (Summary Of Currency Exchange Rates) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 USD ($) | Mar. 31, 2016 | Dec. 31, 2016
Currency Exchange Rates [Line Items] |  |  |
Gain recognized on foreign currency transactions | $ 825 |  |
Australian Dollar [Member] | Spot Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7638 | 0.7677 | 0.7230
Australian Dollar [Member] | Average Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7584 | 0.7216 | 0.7440
New Zealand Dollar [Member] | Spot Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7001 | 0.6926 | 0.6958
New Zealand Dollar [Member] | Average Rate [Member] |  |  |
Currency Exchange Rates [Line Items] |  |  |
Foreign currency exchange rate | 0.7122 | 0.6637 | 0.6973

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