Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 30, 2016	Oct. 02, 2015
Numerators:
Income from continuing operations	$ 7,470	$ 6,568	$ 14,247	$ 29,525
Loss from discontinued operations				(13)
Consolidated net income	$ 7,470	$ 6,568	$ 14,247	$ 29,512
Denominators:
Weighted average common shares outstanding—basic	34,677	34,599	34,689	34,578
Dilutive potential common shares	251	456	200	449
Weighted average common shares outstanding— diluted	34,928	35,055	34,889	35,027
Antidilutive common shares excluded from above	144		112
Basic Earnings (Loss) per Common Share:
From continuing operations	$ 0.22	$ 0.19	$ 0.41	$ 0.85
From discontinued operations				0.00
Basic earnings per share	0.22	0.19	0.41	0.85
Diluted Earnings (Loss) per Common Share:
From continuing operations	0.21	0.19	0.41	0.84
From discontinued operations				0.00
Diluted earnings per share	$ 0.21	$ 0.19	$ 0.41	$ 0.84