Other Operating Income and Expenses, Net (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Other Operating Income and Expenses, Net [Abstract]
Loss on property, plant and equipment disposals		$ 82	$ 41	$ 82	$ 41
(Gain) loss on currency exchanges		5	(15)	(3)	2
Amortization of intangibles		76	76	153	153
Retirement (income) expense		(120)	54	(66)	72
Settlement of class action litigation	[1]	1,514	0	1,514	0
Miscellaneous (income) expense		(50)	(170)	(413)	(229)
Other operating (income) expense, net		$ 1,507	$ (14)	$ 1,267	$ 39

[1] (1) See "Note 18 - Commitments and Contingencies" for further explanation.