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EMPLOYEE RETIREMENT PLANS - Schedule of net periodic pension cost (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
EMPLOYEE RETIREMENT PLANS    
Long-term rate of return on plan assets 6.75% 7.00%
Defined Benefit Pension Plan    
EMPLOYEE RETIREMENT PLANS    
Discount rate for projected benefit obligation 2.83% 2.47%
Discount rate for determining interest cost 2.39% 1.91%
Long-term rate of return on plan assets 6.75% 7.00%
Supplemental Pension Plan    
EMPLOYEE RETIREMENT PLANS    
Discount rate for projected benefit obligation 2.86% 2.51%
Discount rate for determining interest cost 2.54% 2.10%