Earnings Per Share - Schedule of Dilutive Effect of Stock Options RSUs and PSAs (Details) - shares shares in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Basic weighted-average shares outstanding	18,834	18,799	18,805	18,825	18,838	18,873	18,806	18,670	18,816	18,797	18,766
Effect of potential exercise of stock options, RSUs, and PSAs									408	538	478
Diluted weighted-average shares outstanding	19,234	19,169	19,133	19,263	19,333	19,306	19,209	19,158	19,224	19,335	19,244

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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.

+ References

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- Definition

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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