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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
Numerator:      
Profit (Loss) for the year $ 61,127 $ (232,950) $ 57,757
Denominator:      
Weighted average number of shares used in basic EPS 60,901,109 60,668,185 60,217,523
Earnings (Losses) after tax per share (US$) - basic $ 1.00 $ (3.84) $ 0.96
Stock awards at US$ 0.001 559,012 0 2,433,126
Weighted average number of common shares for the purposes of diluted earnings per shares 61,460,121 60,668,185 62,650,649
Earnings (Losses) after tax per share (US$) - diluted $ 0.99 $ (3.84) $ 0.92
Par value per share $ 0.001 $ 0.001 $ 0.001
Description of instruments with potential future dilutive effect not included in calculation of diluted earnings per share   974,159