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Cash and stock-based compensation plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of share-based payment arrangements [Abstract] |
Disclosure of detailed information about restricted stock option to directors [Text Block] | A summary of the restricted stock granted to Directors is presented below:
|  | Shares |  |  | Weighted average grant date fair value |
Outstanding at January 1, 2015 |  |  | 78,336 |  |  |  | 24.37 |
Granted |  |  | 57,000 |  |  |  | 33.78 |
Vested |  |  | (39,015) |  |  |  | 22.69 |
Outstanding at December 31, 2015 |  |  | 96,321 |  |  |  | 30.62 |
Granted |  |  | 57,000 |  |  |  | 24.14 |
Vested |  |  | (56,421) |  |  |  | 28.80 |
Outstanding at December 31, 2016 |  |  | 96,900 |  |  |  | 27.86 |
Granted |  |  | 57,000 |  |  |  | 27.80 |
Vested |  |  | (61,950) |  |  |  | 28.50 |
Outstanding at December 31, 2017 |  |  | 91,950 |  |  |  | 27.40 |
Expected to vest |  |  | 91,950 |  |  |  |  |
Disclosure of number and weighted average exercise prices of other equity instruments [text block] | A summary of the restricted stock units granted to certain executives is presented below:
|  | Shares |  | Weighted average grand date fair value |  | Weighted average remaining contractual term |  | Aggregate Intrinsic value |
Outstanding at January 1, 2015 |  |  | 163,712 |  |  | 18.18 |  |  |  |  |  |  |
Granted |  |  | 63,244 |  |  | 21.67 |  |  |  |  |  |  |
Forfeited |  |  | - |  |  |  |  |  |  |  |  |  |
Vested |  |  | (64,208) |  |  | 17.67 |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 162,748 |  |  | 19.74 |  |  |  |  |  |  |
Granted |  |  | 91,454 |  |  | 18.26 |  |  |  |  |  |  |
Forfeited |  |  | (21,408) |  |  | 17.69 |  |  |  |  |  |  |
Vested |  |  | (65,358) |  |  | 18.83 |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 167,436 |  |  | 19.35 |  |  |  |  |  |  |
Granted |  |  | 25,289 |  |  | 25.70 |  |  |  |  |  |  |
Forfeited |  |  | (71,401) |  |  | 18.61 |  |  |  |  |  |  |
Vested |  |  | (70,519) |  |  | 19.76 |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 50,805 |  |  | 21.07 |  |  | 2.02 years |  | $ | 518 |
Expected to vest |  |  | 50,805 |  |  | 21.07 |  |  | 2.02 years |  | $ | 296 |
Disclosure of detailed information about share options granted to executives [Text Block] | The fair value of stock purchase options granted to certain Executives during 2017 was estimated using a binomial option-pricing model, based on the following factors:
|  | Measuring unit |  | 2017 |  | 2016 |  | 2015 |
Weighted average fair value per option |  | $ |  |  | - |  |  | - |  |  | 1.95 - 2.06 |
Weighted average expected term, in years |  | Year |  |  | - |  |  | - |  |  | 5.5 |
Expected volatility |  | % |  |  | - |  |  | - |  |  | 22 | %
Risk-free rate |  | % |  |  | - |  |  | - |  |  | 0.02 – 1.52 |
Expected dividend |  | % |  |  | - |  |  | - |  |  | 5.00 | %
Disclosure of detailed information about share options granted [Text Block] | A summary of stock options granted is presented below:
|  | Options |  | Weighted average exercise price |  | Weighted average remaining contractual term |  | Aggregate Intrinsic value |
Outstanding at January 1, 2015 |  |  | 391,696 |  |  | 23.65 |  |  |  |  |  |  |
Granted |  |  | 233,418 |  |  | 29.25 |  |  |  |  |  |  |
Forfeited |  |  | - |  |  | - |  |  |  |  |  |  |
Exercised |  |  | (70,358) |  |  | 20.86 |  |  |  |  |  |  |
Outstanding at December 31, 2015 |  |  | 554,756 |  |  | 26.36 |  |  |  |  |  |  |
Granted |  |  | - |  |  | - |  |  |  |  |  |  |
Forfeited |  |  | (126) |  |  | 18.93 |  |  |  |  |  |  |
Exercised |  |  | (68,785) |  |  | 22.78 |  |  |  |  |  |  |
Outstanding at December 31, 2016 |  |  | 485,845 |  |  | 26.87 |  |  |  |  |  |  |
Granted |  |  | - |  |  |  |  |  |  |  |  |  |
Forfeited |  |  | (69,934) |  |  | 28.63 |  |  |  |  |  |  |
Exercised |  |  | (142,268) |  |  | 24.84 |  |  |  |  |  |  |
Outstanding at December 31, 2017 |  |  | 273,643 |  |  | 27.48 |  |  | 3.66 years |  | $ | 242 |
Exercisable |  |  | 121,840 |  |  | 27.73 |  |  | 3.70 years |  | $ | 115 |
Expected to vest |  |  | 151,803 |  |  | 27.28 |  |  | 3.63 years |  | $ | 128 |

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- Definition The disclosure of the number and weighted average exercise prices of other equity instruments (ie other than share options). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + Details
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