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Net income per common share - Reconciliation of denominator used for calculation of basic and diluted net income per common share (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Earnings per share [abstract]
Denominator for basic net income per common share (in shares)	76,592,413	80,494,302
Effect of dilutive stock options (in shares)	17,325	67,631
Effect of dilutive TSARS (in shares)	82,756	327,592
Denominator for diluted net income per common share (in shares)	76,692,494	80,889,525

X

- Definition

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]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2019-01-01
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-URIDate 2019-03-27

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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2019-01-01
-Paragraph 70
-Subparagraph b
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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 33
-IssueDate 2019-01-01
-Paragraph 70
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- Definition

Dilutive Securities, Effect On Basic Earnings Per Share, Tandem Share Appreciation Rights

+ References

No definition available.

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