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. 25, 2020
Jun. 30, 2019
Jun. 25, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure        
Net periodic pension cost $ (258) $ 359 $ (258) $ 733
Cost of Goods Sold        
Defined Benefit Plan Disclosure        
Net periodic pension cost   125   262
Selling, general and administrative expense        
Defined Benefit Plan Disclosure        
Net periodic pension cost   $ 234   $ 471
Other (income) expense, net        
Defined Benefit Plan Disclosure        
Net periodic pension cost $ (258)   $ (258)