RETIREMENT PLANS - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
RETIREMENT PLANS
Service cost - benefits earned	$ 628	$ 1,190	$ 1,355
Interest cost on projected benefit obligation	$ 3,824	$ 2,826	$ 2,632
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Expected return on plan assets	$ (3,879)	$ (4,910)	$ (4,713)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Labor and Related Expense	Labor and Related Expense	Labor and Related Expense
Net amortization and deferral	$ 752	$ 1,259	$ 2,072
Net periodic pension cost	1,325	365	1,346
Net loss (gain) during the period	(1,761)	(5,323)	(5,883)
Amortization of prior service cost			1
Amortization of unrecognized (gain) loss	(752)	(1,259)	(2,072)
Total recognized in other comprehensive (income) loss	2,513	6,582	7,956
Total recognized net periodic pension cost and other comprehensive income	$ (1,188)	$ (6,217)	$ (6,610)