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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2021
Jun. 25, 2020
Jul. 01, 2021
Jun. 25, 2020
Consolidated Statements of Comprehensive Income (Loss)        
Amortization of the net actuarial loss and prior service credit related to the pension, net of tax effect $ 86 $ 65 $ 172 $ 130
Fair market value adjustment of interest rate swap, net of tax benefit (2) (60) 4 (348)
Reclassification adjustment on interest rate swap included in interest expense, net of tax effect $ 43 $ 65 $ 111 $ 96