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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
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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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