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Cash and stock-based compensation plans (Details 1) - Key management personnel of entity or parent [member] - Restricted Stocks [Member] | 12 Months Ended
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Dec. 31, 2017 USD ($) NumberofShare | Dec. 31, 2016 USD ($) NumberofShare | Dec. 31, 2015 USD ($) NumberofShare
Disclosure Of Sharebased Payment Arrangements [Line Items] |  |  |
Number of Shares, Outstanding at Beginning | NumberofShare | 167,436 | 162,748 | 163,712
Number of Shares, Granted | NumberofShare | 25,289 | 91,454 | 63,244
Number of Shares, Forfeited | NumberofShare | (71,401) | (21,408) | 0
Number of Shares, Vested | NumberofShare | (70,519) | (65,358) | (64,208)
Number of Shares, Outstanding at End | NumberofShare | 50,805 | 167,436 | 162,748
Number of Shares, Expected to vest | NumberofShare | 50,805 |  |
Weighted average grand date fair value Outstanding at beginning | $ 19.35 | $ 19.74 | $ 18.18
Weighted average grand date fair value, Granted | 25.70 | 18.26 | 21.67
Weighted average grand date fair value, Forfeited | 18.61 | 17.69 |
Weighted average grand date fair value, Vested | 19.76 | 18.83 | 17.67
Weighted average grand date fair value, Outstanding at End | $ 21.07 | $ 19.35 | $ 19.74
Weighted average remaining contractual term, Outstanding | 2.02 years |  |
Weighted average grand date fair value, Expected to vest | $ 21.07 |  |
Weighted average remaining contractual term, Expected to vest | 2.02 years |  |
Aggregate Intrinsic value, Outstanding | $ 518 |  |
Aggregate Intrinsic value, Expected to vest | $ 296 |  |

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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: 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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