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Earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		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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The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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