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PENSION PLANS - Pension expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
COMPONENTS OF NET PERIODIC COST:      
Interest cost $ 644 $ 666 $ 697
(Gain) loss on assets (628) 750 (1,421)
Amortization of loss (gain) 484 (990) 1,241
Net periodic cost $ 500 $ 426 $ 517
WEIGHTED-AVERAGE ASSUMPTION USED:      
Discount rate 5.00% 5.00% 5.00%
Rate of compensation increase 0.00% 0.00% 0.00%