Annual report pursuant to Section 13 and 15(d)

PENSION AND OTHER RETIREMENTS BENEFITS - Amounts Recognized in Other Comprehensive Income (Loss) (Details)

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PENSION AND OTHER RETIREMENTS BENEFITS - Amounts Recognized in Other Comprehensive Income (Loss) (Details) - Pension Plan - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 25, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure      
Net actuarial (gain) loss $ 0 $ 1,912 $ (879)
Prior service cost 0 0 (316)
Amortization of prior service costs 0 (33) (149)
Amortization of actuarial loss 0 (276) (1,332)
Total (gain) loss recognized in other comprehensive income $ 0 $ 1,603 $ (2,676)