Earnings Per Share (Details) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of Diluted Shares
Denominator for Basic Earnings Per Share (in shares)	40,541,594	41,884,221	40,738,772	41,960,743
Dilutive Effect of Equity Based Awards (in shares)	228,173	267,979	249,229	292,157
Denominator for Diluted Earnings Per Share (in shares)	40,769,767	42,152,200	40,988,001	42,252,900
Antidilutive Stock Options and Restricted Stock Outstanding (in shares)	4,706	1,293	4,706	1,293

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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- Definition

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.

+ References

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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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