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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per share      
Profit for the year $ 63,593 $ 86,053 $ 11,138
Basic earnings per share $ 1.60 $ 2.17 $ 0.28
Diluted earnings per share $ 1.60 $ 2.17 $ 0.28
Weighted average of common shares outstanding - applicable to basic EPS 39,656 39,575 39,543
Effect of diluted securities:      
Stock options and restricted stock units plan 0 0 0
Adjusted weighted average of common shares outstanding applicable to diluted EPS 39,656 39,575 39,543