Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016	Jan. 01, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss)	$ 2,795	$ 4,489	$ 3,238	$ 16,010	$ 45,472
Net income (loss) available to common stockholders	$ 2,173	$ 3,495	$ 2,515	$ 12,438
Basic weighted average common shares outstanding	35,431,806	35,237,053	35,410,482	35,152,091
Basic net income (loss) per share	$ 0.06	$ 0.10	$ 0.07	$ 0.35
Dilutive effect of preferred stock and non-vested shares	9,505,835	9,618,725	9,555,782	9,740,097
Shares used in computing diluted net income (loss) per share	44,937,641	44,855,778	44,966,264	44,892,188
Diluted net income (loss) per share	$ 0.06	$ 0.10	$ 0.07	$ 0.35
Shares excluded from diluted net income (loss) per share computations (1)	0	0	0	0
Restricted Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: Income attributable to participating securities	$ (45)	$ (60)	$ (54)	$ (240)
Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Less: Income attributable to participating securities	$ (577)	$ (934)	$ (669)	$ (3,332)