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EMPLOYEE BENEFIT PLANS - Weighted average assumptions used to determine the projected benefit obligation and net benefit cost (Details) - Retirement Income Plan
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Projected benefit obligation:      
Rate of compensation increase
Net benefit cost:      
Discount rate     2.70%
Expected return on plan assets     4.00%
Rate of compensation increase