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Debt (Westpac Bank Corporate Credit Facility (NZ)) (Narrative) (Details) $ in Thousands, $ in Millions |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 20, 2018 NZD ($) | Dec. 20, 2018 USD ($) | Dec. 19, 2018 NZD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Contractual facility |  |  |  | $ 290,879 | $ 252,929
Westpac Bank Corporate Credit Facility, Tranch 1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual facility | $ 32.0 |  | $ 35.0 |  |
Maturity date |  |  |  | Dec. 31, 2023 |
Interest rate | 1.10% | 1.10% |  |  |
Westpac Bank Corporate Credit Facility, Tranch 1 [Member] | Bank Bill Swap Bid Rate [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate | 1.75% | 1.75% |  |  |
Westpac Bank Corporate Credit Facility, Tranch 2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual facility |  | $ 18,000 |  |  |

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