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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Net income attributable to shareholders	$ 13,807	$ 38,424	$ 29,941	$ 90,394
Weighted average common shares outstanding – Basic (in shares)	43,329	43,181	43,277	43,116
Dilutive impact of share-based compensation awards (in shares)	432	365	390	408
Weighted average common shares outstanding – Diluted (in shares)	43,761	43,546	43,667	43,524

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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 average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Net Income (Loss) Attributable to Parent, After Accretion of Non-controlling Interest

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