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EMPLOYEE BENEFIT PLANS - Weighted-average assumptions used to determine net periodic benefit cost (Details) - Defined Benefit Pension Items
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
WEIGHTED AVERAGE ASSUMPTIONS:      
Discount rate 2.48% 3.20% 4.28%
Expected return on plan assets 7.00% 7.00% 7.50%
Rate of compensation increase 2.50% 2.50% 2.50%