Earnings Per Common Share - Reconciliation of Weighted Average Number of Common Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding – basic (in shares)	192,325	144,948	175,010	138,438
Dilutive effect of share-based awards (in shares)	1,533	2,610	1,696	2,730
Equity forward contract (in shares)	3,505	68	2,264	23
Weighted average common shares outstanding – diluted (in shares)	197,363	147,626	178,970	141,191

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Additional shared included in the calculation of diluted EPS as a result of the potentially dilutive effect of equity forward arrangements using the reverse treasury stock method.

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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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