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Borrowings (New Zealand Westpac Bank Corporate Credit Facility) (Narrative) (Details) $ in Thousands, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 20, 2018 NZD ($) | Dec. 19, 2018 NZD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Contractual facility |  |  | $ 252,929 | $ 271,732
Westpac Bank Corporate Credit Facility, Tranch 1 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 32.0 | $ 35.0 |  |
Interest rate | 1.10% |  |  |
Westpac Bank Corporate Credit Facility, Tranch 1 [Member] | Bank Bill Swap Bid Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 1.75% |  |  |
Westpac Bank Corporate Credit Facility, Tranch 2 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 18.0 |  |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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