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Post-Retirement Health Care (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Retirement Benefits [Abstract]
Service cost	$ 213	$ 186	$ 426	$ 371
Interest cost	197	206	394	412
Amortization of net (gain) loss	26	6	63	13
Net periodic post-retirement benefit cost	$ 436	$ 398	$ 883	$ 796

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