Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings/(Accumulated Deficit) [Member]	Treasury Stock [Member]
Beginning Balance at Dec. 29, 2018	$ 385,544	$ 607	$ 409,661	$ (3,065)	$ (8,900)	$ (12,759)
Beginning Balance, Shares at Dec. 29, 2018		58,081,540
Vesting of restricted stock, Shares		133,770
Grants of restricted stock		$ 5	(5)
Purchases of treasury stock	(505)					(505)
Purchases of treasury stock, Shares		(34,240)
Retirement of treasury stock			(505)			505
Stock-based compensation	1,198		1,198
Exercise of stock options	213	$ 1	212
Exercise of stock options, Shares		106,740
Common stock issued under ESPP	17		17
Common stock issued under ESPP, Shares		1,061
Net income	8,257				8,257
Other comprehensive income	1,124			1,124
Ending Balance at Mar. 30, 2019	395,848	$ 613	410,578	(1,941)	(643)	(12,759)
Ending Balance, Shares at Mar. 30, 2019		58,288,871
Beginning Balance at Dec. 28, 2019	431,548	$ 619	414,688	(238)	34,788	(18,309)
Beginning Balance, Shares at Dec. 28, 2019		58,504,734
Vesting of restricted stock, Shares		175,824
Grants of restricted stock		$ 6	(6)
Forfeitures of restricted stock		$ (1)	1
Purchases of treasury stock	(815)					(815)
Purchases of treasury stock, Shares		(51,479)
Retirement of treasury stock		$ (1)	(814)			815
Stock-based compensation	1,530		1,530
Exercise of stock options	$ 549	$ 3	546
Exercise of stock options, Shares	274,353	274,353
Common stock issued under ESPP	$ 119		119
Common stock issued under ESPP, Shares		15,191
Net income	15,600				15,600
Other comprehensive income	(3,450)			(3,450)
Ending Balance at Apr. 04, 2020	$ 445,081	$ 626	$ 416,064	$ (3,688)	$ 50,388	$ (18,309)
Ending Balance, Shares at Apr. 04, 2020		58,918,623