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Employee Benefit Plans (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2018	Dec. 28, 2017	Dec. 29, 2016
Net periodic pension cost:
Service cost	$ 926	$ 765	$ 865
Interest cost	1,364	1,356	1,406
Net amortization of prior service cost and actuarial loss	621	356	364
Curtailment gain	0	0	(251)
Total	$ 2,911	$ 2,477	$ 2,384

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Amount before tax, after reclassification adjustments, of interest cost that has not been recognized in the income statement.

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Amount after tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit),actuarial gain loss related to pension and other postretirement benefit plans.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

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