Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 03, 2017	Sep. 27, 2016	Jun. 28, 2016	Mar. 29, 2016	Dec. 29, 2015	Sep. 29, 2015	Jun. 30, 2015	Mar. 31, 2015	Jan. 03, 2017	Dec. 29, 2015	Dec. 30, 2014
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 129,400	$ 122,681	$ 121,407	$ 113,986	$ 117,128	$ 117,328	$ 115,233	$ 105,761	$ 487,474	$ 455,451	$ 403,741
Operating income	(44,315)	(9,062)	(11,312)	(2,839)	(6,464)	(15,302)	5,016	(4,318)	(67,528)	(21,067)	18,915
Net (loss) income	$ (45,376)	$ (9,841)	$ (14,087)	$ (2,373)	$ (4,254)	$ (9,821)	$ 3,062	$ (2,752)	$ (71,677)	$ (13,765)	$ 11,428
Basic EPS (USD per share)	$ (1.63)	$ (0.35)	$ (0.51)	$ (0.09)	$ (0.15)	$ (0.35)	$ 0.10	$ (0.09)	$ (2.58)	$ (0.48)	$ 0.38
Diluted EPS (USD per share)	$ (1.63)	$ (0.35)	$ (0.51)	$ (0.09)	$ (0.15)	$ (0.35)	$ 0.10	$ (0.09)	$ (2.58)	$ (0.48)	$ 0.37