Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Apr. 01, 2018	Apr. 02, 2017	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ (3,102)	$ (5,596)	$ 7,159
Net income (loss) available to common stockholders	$ (3,102)	$ (5,596)
Basic weighted average common shares outstanding	35,665,811	35,384,223
Basic net income (loss) per share	$ (0.09)	$ (0.16)
Dilutive effect of preferred stock and non-vested shares	0	0
Shares used in computing diluted net income (loss) per share	35,665,811	35,384,223
Diluted net income (loss) per share	$ (0.09)	$ (0.16)
Shares excluded from diluted net income (loss) per share computations (1)	10,233,980	10,207,697
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: Income attributable to participating securities	$ 0	$ 0
Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: Income attributable to participating securities	$ 0	$ 0