Quarterly report pursuant to Section 13 or 15(d)

PENSION BENEFITS - Components of Net Periodic Benefit (Credit) Cost Expense (Details)

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PENSION BENEFITS - Components of Net Periodic Benefit (Credit) Cost Expense (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
Retirement Benefits [Abstract]          
Service cost $ 0 $ 16 $ 27 $ 32 $ 41
Interest cost 0 260 542 519 593
Expected return on plan assets 0 (400) (817) (799) (817)
Recognized actuarial loss 0 9 236 18 276
Amortization of prior service cost 0 0 33 0 33
Net periodic benefit (credit) cost $ 0 $ (115) $ 21 $ (230) $ 126
Defined Benefit Plan, Type [Extensible List]   us-gaap:PensionPlansDefinedBenefitMember   us-gaap:PensionPlansDefinedBenefitMember