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Financial Instruments-risk management (Schedule of Gearing Ratios) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Financial Instruments risk Management [Abstract] |  |  |  |
Net Debt | $ 573,488 | $ 582,679 |  |
Total Equity | (61,945) | (109,190) | $ 132,885 | $ 143,021
Total Capital | $ 511,543 | $ 473,489 |  |
Gearing Ratio | 112.00% | 123.00% |  |

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