Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 13, 2017	Jun. 14, 2016	Jun. 13, 2017	Jun. 14, 2016
Earnings Per Share [Abstract]
Net income	$ 2,090	$ 4,444	$ 5,400	$ 9,855
Shares:
Weighted average number of common shares outstanding (in shares)	21,722,126	23,349,718	22,390,745	23,332,397
Dilutive shares (in shares)	338,801	87,265	329,146	86,338
Total Diluted Shares (in shares)	22,060,927	23,436,983	22,719,891	23,418,735
Basic earnings per common share (in usd per share)	$ 0.10	$ 0.19	$ 0.24	$ 0.42
Diluted earnings per common share (in usd per share)	$ 0.09	$ 0.19	$ 0.24	$ 0.42

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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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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