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PENSION PLANS - Pension expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
COMPONENTS OF NET PERIODIC COST:      
Interest cost $ 665 $ 658 $ 644
Gain on assets (842) (758) (628)
Amortization of loss 105 247 484
Net periodic (benefit) cost $ (72) $ 147 $ 500
WEIGHTED-AVERAGE ASSUMPTION USED:      
Discount rate 5.00% 5.00% 5.00%
Rate of compensation increase 0.00% 0.00% 0.00%