EMPLOYEE RETIREMENT PLANS - Schedule of net periodic pension cost (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Employee Retirement Plans
Long-term rate of return on plan assets	6.75%
Defined Benefit Pension Plan
Employee Retirement Plans
Discount rate for projected benefit obligation	5.41%	2.83%
Discount rate for determining interest cost	5.35%	2.39%
Long-term rate of return on plan assets	6.75%	6.75%
Supplemental Pension Plan
Employee Retirement Plans
Discount rate for projected benefit obligation	5.44%	2.86%
Discount rate for determining interest cost	5.37%	2.54%