Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Including Additional Paid in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2018		$ 83,826	$ 180,356	$ (264)	$ (7,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised		839
Stock awards vested		(1)
Stock repurchased related to the exercise of stock options		(3,976)
Stock-based compensation		3,271
Net Income	$ 15,287
Other Comprehensive Income, Net of Tax	249				249
Ending Balance at Jun. 29, 2019	272,230	83,959	195,379		(7,108)
Beginning Balance at Mar. 30, 2019		83,485	187,564		(7,271)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised		742
Stock repurchased related to the exercise of stock options		(2,075)
Stock-based compensation		1,807
Net Income	7,815
Other Comprehensive Income, Net of Tax	163				163
Ending Balance at Jun. 29, 2019	272,230	83,959	195,379		(7,108)
Beginning Balance at Dec. 31, 2019	292,800	88,515	212,553		(8,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Purchase Plan		1,112
Stock options exercised		270
Stock awards vested		(1)
Stock repurchased related to the exercise of stock options		(2,663)
Stock-based compensation		4,529
Net Income	13,020
Other Comprehensive Income, Net of Tax	540				540
Ending Balance at Jun. 27, 2020	309,607	91,762	225,573		(7,728)
Beginning Balance at Mar. 28, 2020		89,936	220,483		(7,992)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised		231
Stock repurchased related to the exercise of stock options		(655)
Stock-based compensation		2,250
Net Income	5,090
Other Comprehensive Income, Net of Tax	264				264
Ending Balance at Jun. 27, 2020	$ 309,607	$ 91,762	$ 225,573		$ (7,728)