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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Earnings per share |  |  |
Profit for the year | $ 62,697 | $ 63,593 | $ 86,053
Basic earnings per share (in dollars per share) | $ 1.62 | $ 1.60 | $ 2.17
Diluted earnings per share (in dollars per share) | $ 1.62 | $ 1.60 | $ 2.17
Weighted average of common shares outstanding applicable to basic EPS (in shares) | 38,796 | 39,656 | 39,575
Effect of diluted securities: |  |  |
Stock options and restricted stock units plan (in shares) | 0 | 0 | 0
Adjusted weighted average of common shares outstanding applicable to diluted EPS (in shares) | 38,796 | 39,656 | 39,575

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