Net Income per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Net Income per Common Share [Abstract]
Net (loss) income	$ (778)	$ 1,416	$ 23,683	$ 14,385
Basic weighted-average shares outstanding	41,716,000	46,394,000	42,233,000	47,247,000
Dilutive effect of stock-based awards	0	650,000	847,000	698,000
Diluted weighted-average shares outstanding	41,716,000	47,044,000	43,080,000	47,945,000
Net (loss) income per share – basic (in USD per share)	$ (0.02)	$ 0.03	$ 0.56	$ 0.30
Net (loss) income per share – diluted (in USD per share)	$ (0.02)	$ 0.03	$ 0.55	$ 0.30