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Post-Retirement Health Care (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Retirement Benefits [Abstract]
Service cost	$ 185	$ 184	$ 556	$ 552
Interest cost	206	212	619	634
Amortization of (gain)/loss	6	16	19	46
Net periodic benefit cost	$ 397	$ 412	$ 1,194	$ 1,232

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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-Publisher FASB
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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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