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Insurance Recoveries (Narrative) (Details) NZD in Thousands, $ in Thousands | 1 Months Ended | 9 Months Ended | 12 Months Ended
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May 31, 2017 NZD | May 31, 2017 USD ($) | Apr. 30, 2017 NZD | Apr. 30, 2017 USD ($) | Sep. 30, 2017 NZD | Sep. 30, 2017 USD ($) | Dec. 31, 2016 NZD | Dec. 31, 2016 USD ($)
Insurance Recoveries [Abstract] |  |  |  |  |  |  |  |
Insurance coverage limit |  |  | NZD 36,000 | $ 25,000 |  |  |  |
Proceeds from insurance settlement | NZD 28,900 | $ 20,000 |  |  |  |  | NZD 7,100 | $ 5,000
Total insurance gains |  |  |  |  | NZD 14,849 | $ 10,740 |  |

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