Quarterly report pursuant to Section 13 or 15(d)

PENSION BENEFITS - Components of net periodic benefit (credit) expense (Details)

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PENSION BENEFITS - Components of net periodic benefit (credit) expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2020
Jun. 30, 2019
Jun. 25, 2020
Jun. 30, 2019
PENSION BENEFITS        
Service cost   $ 152   $ 304
Interest cost $ 452 275 $ 452 566
Expected return on plan assets (818) (365) (818) (731)
Recognized actuarial loss 108 276 108 552
Amortization of prior service cost   21   42
Total net periodic benefit cost $ (258) $ 359 $ (258) $ 733