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Net Income (Loss) Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Basic weighted average shares outstanding (in Shares)	48,487	48,140	48,406	48,104
Add effects of share-based compensation instruments (in Shares)	851	163	857	137
Diluted weighted average shares outstanding (in Shares)	49,338	48,303	49,263	48,241

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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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