CONSOLIDATED STATEMETS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
Mar. 30, 2019	Mar. 31, 2018
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, Tax	$ (1,383)	$ (1,758)
Unrealized (loss) gain on interest rate swap, tax	$ (3,177)	$ 1,696

Amount, before reclassification adjustment, of tax (expense) benefit for (increase) decrease in accumulated other comprehensive income for defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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