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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2011
Numerator:        
Profit (Loss) for the year attributable to owners $ 57,757 $ 72,415 $ (24,228)  
Denominator:        
Weighted average number of shares used in basic EPS 60,217,523 60,612,230 60,093,191  
Earnings (Losses) after tax per share (US$) - basic $ 0.96 $ 1.19 $ (0.40)  
Weighted average number of shares used in basic EPS 60,217,523 60,612,230 60,093,191  
Stock awards at US$ 0.001 2,433,126 4,758,552 0  
Weighted average number of common shares for the purposes of diluted earnings per shares 62,650,649 65,370,782 60,093,191  
Earnings (Losses) after tax per share (US$) - diluted $ 0.92 $ 1.11 $ (0.40)  
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     4,564,777