Condensed Consolidated Statement Of Changes In Stockholders' Equity (Unaduited) - 6 months ended Jun. 13, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid In Capital	Treasury Stock	Retained Earnings
Beginning Balance at Dec. 27, 2016	$ 246,366	$ 24	$ 143,325	$ (17,823)	$ 120,840
Beginning Balance, shares at Dec. 27, 2016		23,272,274
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,400				5,400
Share-based compensation costs	$ 1,327		1,327
Stock option exercises, shares	52,327	52,327
Stock option exercises	$ 447		447
Shares issued under stock compensation plan, net of shares withheld for tax effects		38,743
Shares issued under stock compensation plan, net of shares withheld for tax effects	(183)		(183)
Treasury stock purchases, shares		(1,761,294)
Treasury stock purchases	(29,940)			(29,940)
Ending Balance at Jun. 13, 2017	$ 223,417	$ 24	$ 144,916	$ (47,763)	$ 126,240
Ending Balance, shares at Jun. 13, 2017		21,602,050.00