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Share capital (Schedule of Share Capital) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Disclosure of classes of share capital [abstract]
Common shares issued, shares	41,496,950	39,540,384
Common shares issued, value	$ 207,012	$ 202,191

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- References

No definition available.

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- Definition

The nominal value of capital issued.

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- Definition

The number of shares issued by the entity.

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