Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 4,655	$ 5,014	$ 10,593	$ 22,425
Other Comprehensive Income (Loss)
Amortization of actuarial losses and prior service costs, net of tax benefit of $74 and $71 for the three months ended September 30, 2017 and October 1, 2016, respectively, and $225 and $212 for the nine months ended September 30, 2017 and October 1, 2016, respectively	128	120	382	360
Change in unrealized gains and losses on cash flow hedges, net of tax of $17 and zero for the three months ended September 30, 2017 and October 1, 2016, respectively, and $161 and $326 for the nine months ended September 30, 2017 and October 1, 2016, respectively	(28)	0	(271)	(556)
Other Comprehensive Income (Loss)	100	120	111	(196)
Comprehensive Income	$ 4,755	$ 5,134	$ 10,704	$ 22,229