Other Non-Operating Income and Expenses, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Other Non-Operating Income and Expenses, Net [Abstract]
Post-retirement income	$ (5)	$ (5)
Miscellaneous (income) expense	7	4
Other expense (income), net	$ 2	$ (1)