Earnings Per Common Share - Reconciliation of Weighted Average Number of Common Shares Outstanding (Details) - shares shares in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Weighted average common shares outstanding – basic (in shares)	182,325	143,499	165,869	133,965
Dilutive effect of share-based awards (in shares)	1,606	2,975	1,778	2,772
Equity forward contract (in shares)	2,186	0	1,658	0
Weighted average common shares outstanding – diluted (in shares)	186,117	146,474	169,305	136,737

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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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