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		164,226
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	2,276		2,276
Exercise of stock options	840	$ 3	837
Exercise of stock options, Shares		322,000
Common stock issued under ESPP	31		31
Common stock issued under ESPP, Shares		2,143
Net income	25,302				25,302
Other comprehensive income (Loss)	887			887
Ending Balance at Jun. 29, 2019	414,375	$ 615	412,295	(2,178)	16,402	(12,759)
Ending Balance, Shares at Jun. 29, 2019		58,535,669
Beginning Balance at Mar. 30, 2019	395,848	$ 613	410,578	(1,941)	(643)	(12,759)
Beginning Balance, Shares at Mar. 30, 2019		58,288,871
Vesting of restricted stock, Shares		30,456
Stock-based compensation	1,078		1,078
Exercise of stock options	627	$ 2	625
Exercise of stock options, Shares		215,260
Common stock issued under ESPP	14		14
Common stock issued under ESPP, Shares		1,082
Net income	17,045				17,045
Other comprehensive income (Loss)	(237)			(237)
Ending Balance at Jun. 29, 2019	414,375	$ 615	412,295	(2,178)	16,402	(12,759)
Ending Balance, Shares at Jun. 29, 2019		58,535,669
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		219,977
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	2,918		2,918
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	17,799				17,799
Other comprehensive income (Loss)	(1,108)			(1,108)
Ending Balance at Jul. 04, 2020	451,010	$ 626	417,452	(1,346)	52,587	(18,309)
Ending Balance, Shares at Jul. 04, 2020		58,962,776
Beginning Balance at Apr. 04, 2020	445,081	$ 626	416,064	(3,688)	50,388	(18,309)
Beginning Balance, Shares at Apr. 04, 2020		58,918,623
Vesting of restricted stock, Shares		44,153
Stock-based compensation	$ 1,388		1,388
Exercise of stock options, Shares	0
Net income	$ 2,199				2,199
Other comprehensive income (Loss)	2,342			2,342
Ending Balance at Jul. 04, 2020	$ 451,010	$ 626	$ 417,452	$ (1,346)	$ 52,587	$ (18,309)
Ending Balance, Shares at Jul. 04, 2020		58,962,776