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EMPLOYEE RETIREMENT PLANS - Amounts to be Amortized from Accumulated Other Comprehensive Loss into Net Periodic Pension Cost in Next Fiscal Year (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Estimated amounts to be amortized from accumulated other comprehensive loss in next fiscal year [Abstract]  
Amortization of prior service cost $ 1,099
Amortization of loss 4,936
Total $ 6,035