Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 5,014	$ (9,515)	$ 22,425	$ (9,706)
Other Comprehensive Income (Loss)
Amortization of actuarial losses and prior service costs, net of tax of $71 and $83 for the three months ended October 1, 2016 and October 3, 2015, respectively, and $212 and $248 for the nine months ended October 1, 2016 and October 3, 2015, respectively	120	139	360	417
Change in unrealized gains and losses on cash flow hedges, net of tax of zero for both the three months ended October 1, 2016 and October 3, 2015, and $326 and zero for the nine months ended October 1, 2016 and October 3, 2015, respectively	0	0	(556)	0
Other Comprehensive Income (Loss)	120	139	(196)	417
Comprehensive Income (Loss)	$ 5,134	$ (9,376)	$ 22,229	$ (9,289)