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Earnings per Share - Summary of Net Earning Attributable to Shareholders and Reconciliation of Basic and Diluted Shares (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to shareholders	$ 57,322	$ 33,971	$ 145,253	$ 80,462
Weighted average common shares outstanding – Basic (in shares)	43,191	43,014	43,141	42,963
Dilutive impact of share-based compensation awards (in shares)	424	87	417	129
Weighted average common shares outstanding – Diluted (in shares)	43,615	43,101	43,558	43,092

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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