Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,591	$ 3,823	$ 4,191	$ 5,938
Other Comprehensive Income (Loss), Net of Tax:
Amortization of actuarial losses and prior service costs, net of tax benefit of $44 and $88 for the three months ended June 30, 2018 and July 1, 2017, respectively, and $89 and $151 for the six months ended June 30, 2018 and July 1, 2017, respectively	142	114	283	254
Change in unrealized gains and losses on cash flow hedges, net of tax of $28 and $72 for the three months ended June 30, 2018 and July 1, 2017, respectively, and $89 and $144 for the six months ended June 30, 2018 and July 1, 2017, respectively	87	(122)	281	(243)
Other Comprehensive Income (Loss), Net of Tax	229	(8)	564	11
Comprehensive Income	$ 1,820	$ 3,815	$ 4,755	$ 5,949