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Borrowings (Westpac Bank Corporate Credit Facility (NZ)) (Narrative) (Details) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) | Dec. 31, 2022 NZD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |
Contractual facility | $ 227,633 |  | $ 248,948 |
Repayment of long-term borrowings | 15,980 |  | 88,417 | $ 29,896
Westpac Bank Corporate Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, increase in maximum borrowing capacity |  | $ 13.8 |  |
Contractual facility | $ 8,777 |  | $ 9,465 |
Maturity date | Jan. 01, 2024 | Jan. 01, 2024 | Jan. 01, 2024 |
Interest rate | 1.65% | 1.65% |  |
Westpac Bank Corporate Credit Facility [Member] | Bank Bill Swap Bid Rate [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate | 2.40% | 2.40% |  |

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