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Share Capital (Earnings (loss) per share) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of share capital, reserves and other equity interest [Abstract]
Net earnings (loss)	$ 26,600,000	$ (17,900,000.0)
Weighted average number of common shares outstanding (in shares)	305,521,000	265,234,000
Basic loss per share (usd per share)	$ 0.09	$ (0.07)
Dilutive effect of potential common share equivalents (in shares)	3,500,000	0
Diluted weighted average number of common shares outstanding (in shares)	309,021,000	265,234,000
Diluted loss per share (usd per share)	$ 0.09	$ (0.07)

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Disclosure of share capital, reserves and other equity interest [Abstract]

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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]]

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The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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

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The total of income less expenses, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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