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Earnings per share (Tables)
12 Months Ended
Dec. 31, 2017
Disclosure of earnings per share [Abstract]  
Disclosure of detailed information about reconciliation of income and shares in earnings per share [Text Block]
The following table presents a reconciliation of the income and share data used in the basic and diluted earnings per share (“EPS”) computations for the dates indicated:
 
 
 
December 31,
2017
 
December 31,
2016
 
December 31,
2015
 
(Thousands of U.S. dollars)
 
 
 
 
 
 
 
 
 
 
Profit for the year
 
 
81,999
 
 
87,045
 
 
103,984
 
 
 
 
 
 
 
 
 
 
 
 
(U.S. dollars)
 
 
 
 
 
 
 
 
 
 
Basic earnings per share
 
 
2.09
 
 
2.23
 
 
2.67
 
Diluted earnings per share
 
 
2.08
 
 
2.22
 
 
2.66
 
 
 
 
 
 
 
 
 
 
 
 
(Share units)
 
 
 
 
 
 
 
 
 
 
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