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General - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 27, 2019
Dec. 27, 2018
General    
Unrecognized loss on interest rate swap agreements $ (958) $ (149)
Net unrecognized actuarial loss for pension obligation (6,450) (6,609)
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (7,408) $ (6,758)