Quarterly report pursuant to Section 13 or 15(d)

PENSION BENEFITS - Net Periodic Benefit Costs Reflected in the Company's Financial Statements (Details)

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PENSION BENEFITS - Net Periodic Benefit Costs Reflected in the Company's Financial Statements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 25, 2020
Jun. 30, 2021
Jun. 25, 2020
Defined Benefit Plan Disclosure          
Net periodic benefit (credit) cost $ 0 $ (115) $ 21 $ (230) $ 126
Selling, general and administrative expense          
Defined Benefit Plan Disclosure          
Net periodic benefit (credit) cost 0 16 27 32 41
Other income, net          
Defined Benefit Plan Disclosure          
Net periodic benefit (credit) cost $ 0 $ (131) $ (6) $ (262) $ 85