Net Income (Loss) Per Share Earnings Per Share Table (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 3,921	$ 2,795	$ 6,039	$ (5,596)	$ 4,489	$ 9,376	$ 2,145	$ 29,462	$ 7,159	$ 45,472	$ 4
Net income available to common stockholders									$ 5,562	$ 35,395	$ 3
Basic weighted average common shares outstanding									35,416,531	35,178,329	34,958,847
Basic and diluted net income (loss) per share	$ 0.09	$ 0.06	$ 0.13	$ (0.16)	$ 0.10	$ 0.21	$ 0.05	$ 0.65	$ 0.16	$ 1.01	$ 0.00
Net income (loss)	$ 3,921	$ 2,795	$ 6,039	$ (5,596)	$ 4,489	$ 9,376	$ 2,145	$ 29,462	$ 7,159	$ 45,472	$ 4
Basic weighted average common shares outstanding									35,416,531	35,178,329	34,958,847
Weighted Average Number Diluted Shares Outstanding Adjustment									9,559,983	9,673,016	9,664,404
Diluted weighted average common shares outstanding									44,976,514	44,851,345	44,623,251
Basic and diluted net income (loss) per share	$ 0.09	$ 0.06	$ 0.13	$ (0.16)	$ 0.10	$ 0.21	$ 0.05	$ 0.65	$ 0.16	$ 1.01	$ 0.00
Restricted Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Less: income attributable to participating securities									$ (118)	$ (616)	$ 0
Convertible Preferred Stock [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Less: income attributable to participating securities									$ (1,479)	$ (9,461)	$ (1)