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Financial Instruments-risk management (Schedule of Gearing Ratios) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Financial Instruments-risk management |  |  |  |
Net Debt | $ 368,799 | $ 573,488 |  |
Total Equity | 115,585 | (61,945) | $ (109,190) | $ 132,885
Total Capital | $ 484,384 | $ 511,543 |  |
Gearing Ratio | 76.00% | 112.00% |  |

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