Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 4,171	$ 4,655	$ 8,362	$ 10,593
Other Comprehensive Income (Loss), Net of Tax:
Amortization of actuarial losses and prior service costs, net of tax benefit of $45 and $74 for the three months ended September 29, 2018 and September 30, 2017, respectively, and $134 and $225 for the nine months ended September 29, 2018 and September 30, 2017, respectively	140	128	423	382
Change in unrealized gains and losses on cash flow hedges, net of tax of $16 and $17 for the three months ended September 29, 2018 and September 30, 2017, respectively, and $104 and $161 for the nine months ended September 29, 2018 and September 30, 2017, respectively	49	(28)	330	(271)
Other Comprehensive Income (Loss), Net of Tax	189	100	753	111
Comprehensive Income	$ 4,360	$ 4,755	$ 9,115	$ 10,704