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Share capital - Non-Option Equity Instruments Rollforward (Details) - Restricted Share Units - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of outstanding units, beginning of year	1,270	1,237
Number of units granted	1,455	1,793
Number of units vested and converted to common shares	(671)	(1,760)
Number of outstanding units, end of year	2,054	1,270

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

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- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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