Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 7,815	$ 1,591	$ 15,287	$ 4,191
Other Comprehensive Income (Loss), Net of Tax:
Amortization of actuarial loss and prior service costs, net of tax of $51 and $44 for the three months ended June 29, 2019 and June 30, 2018, respectively, and $103 and $89 for the six months ended June 29, 2019 and June 30, 2018, respectively	170	142	340	283
Change in unrealized gains and losses on cash flow hedges, net of tax of $5 and $28 for the three months ended June 29, 2019 and June 30, 2018, respectively, and $27 and $89 for the six months ended June 29, 2019 and June 30, 2018, respectively	(7)		(91)
Change in unrealized gains and losses on cash flow hedges, net of tax of $5 and $28 for the three months ended June 29, 2019 and June 30, 2018, respectively, and $27 and $89 for the six months ended June 29, 2019 and June 30, 2018, respectively		153		465
Other Comprehensive Income (Loss), Net of Tax	163	295	249	748
Comprehensive Income	$ 7,978	$ 1,886	$ 15,536	$ 4,939