Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Outstanding [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Treasury Stock, At Cost [Member]
Beginning Balance at Dec. 29, 2013	$ 190,770		$ 244	$ 109,901	$ 106,565	$ (25,940)
Beginning Balance, Shares at Dec. 29, 2013		22,297,701
Net income	12,061				12,061
Dividends on common stock ($0.30 per share)	(6,699)				(6,699)
Issuance of nonvested share awards			$ 2	(2)
Issuance of nonvested share awards, Shares			152,920
Exercise of share option awards	63			63
Exercise of share option awards, Shares			10,525
Share-based compensation	1,451			1,451
Tax deficiency from share-based awards activity	(421)			(421)
Forfeiture of nonvested share awards, Shares			(11,550)
Retirement of common stock for payment of withholding tax	(809)		$ (1)	(808)
Retirement of common stock for payment of withholding tax, Shares			(52,927)
Purchases of treasury stock	(2,364)					$ (2,364)
Purchases of treasury stock, Shares						(205,724)
Ending Balance at Sep. 28, 2014	194,052		$ 245	110,184	111,927	$ (28,304)
Ending Balance, shares at Sep. 28, 2014		22,190,945
Beginning Balance at Dec. 28, 2014	195,004		245	110,707	112,521	(28,469)
Beginning Balance, Shares at Dec. 28, 2014		22,180,458
Net income	11,022				11,022
Dividends on common stock ($0.30 per share)	(6,628)				(6,628)
Issuance of nonvested share awards			$ 2	(2)
Issuance of nonvested share awards, Shares			152,140
Exercise of share option awards	$ 83			83
Exercise of share option awards, Shares	12,875		12,875
Share-based compensation	$ 1,599			1,599
Tax deficiency from share-based awards activity	(124)			(124)
Forfeiture of nonvested share awards, Shares			(6,355)
Retirement of common stock for payment of withholding tax	$ (685)		$ (1)	(684)
Retirement of common stock for payment of withholding tax, Shares	(52,621)		(52,621)
Purchases of treasury stock	$ (3,195)					$ (3,195)
Purchases of treasury stock, Shares						(278,242)
Ending Balance at Sep. 27, 2015	$ 197,076		$ 246	$ 111,579	$ 116,915	$ (31,664)
Ending Balance, shares at Sep. 27, 2015		22,008,255