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Related parties (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 14, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of classes of share capital held by him personally [Line Items] |  |  |  |
Number of shares outstanding |  | 60,200,000 | 61,000,000.0 | 59,200,000
Wages and salaries |  | $ 42,236,000 | $ 49,338,000 | $ 55,325,000
Executive Officer [Member] |  |  |  |
Disclosure of classes of share capital held by him personally [Line Items] |  |  |  |
Wages and salaries |  | 392,000 | 336,000 | 390,000
Other long-term employee benefits |  | 230,000 | $ 225,000 | $ 191,000
Professional fees expense |  | $ 34,000 |  |
James F. Park [Member] |  |  |  |
Disclosure of classes of share capital held by him personally [Line Items] |  |  |  |
Shares pledged under lending arrangements | 602,400 |  |  |

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