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Financial instruments by category (Narrative) (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Financial instruments by category [Abstract] |  |  |
Cash on hand | $ 17,000 | $ 23,000 | $ 21,000
Financial liabilities, at fair value | $ 661,404,000 | $ 797,126,000 |

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