Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Numerators:
Income from continuing operations	$ 4,871	$ 19,511	$ 6,777	$ 22,957
Loss from discontinued operations		(13)		(13)
Consolidated net income	$ 4,871	$ 19,498	$ 6,777	$ 22,944
Denominators:
Weighted average common shares outstanding—basic	34,734	34,630	34,696	34,567
Dilutive potential common shares	153	399	174	447
Weighted average common shares outstanding— diluted	34,887	35,029	34,870	35,014
Antidilutive common shares excluded from above	193		97
Basic Earnings (Loss) per Common Share:
From continuing operations	$ 0.14	$ 0.56	$ 0.20	$ 0.66
From discontinued operations		0.00		0.00
Basic earnings per share	0.14	0.56	0.20	0.66
Diluted Earnings (Loss) per Common Share:
From continuing operations	0.14	0.56	0.19	0.66
From discontinued operations		0.00		0.00
Diluted earnings per share	$ 0.14	$ 0.56	$ 0.19	$ 0.66