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Debt (Westpac Bank Corporate Credit Facility) (Narrative) (Details) $ in Thousands, NZD in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 26, 2017 NZD | Apr. 26, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Contractual facility |  |  | $ 272,292 | $ 266,134
Westpac Bank Corporate Credit Facility, Tranch 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | NZD 35.0 | $ 24,500 |  |
Maturity date | Mar. 31, 2018 | Mar. 31, 2018 |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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