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Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of earnings per share [Abstract] |  |  |  |
Profit for the year | [1] | $ 81,999 | $ 87,045 | $ 103,984
Basic earnings per share |  | $ 2.09 | $ 2.23 | $ 2.67
Diluted earnings per share |  | $ 2.08 | $ 2.22 | $ 2.66
Weighted average common shares outstanding - applicable to basic |  | 39,311 | 39,085 | 38,925
Effect of diluted securities: |  |  |  |
Stock options and restricted stock units plans |  | 18 | 125 | 188
Adjusted weighted average common shares outstanding applicable to diluted EPS |  | 39,329 | 39,210 | 39,113
[1] | The numbers set out in these tables have been rounded and accordingly may not total exactly.

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