RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Components of the plan's net periodic pension cost
Settlements		$ 369
Pension benefits
Components of the plan's net periodic pension cost
Service cost	$ 22	38
Interest cost	824	593
Expected return on plan assets	(729)	(953)
Amortization of unrecognized actuarial gain	(11)
Settlements		369
Net periodic pension expense (benefit)	106	47
Postretirement benefits
Components of the plan's net periodic pension cost
Service cost	16	31
Interest cost	45	35
Amortization of unrecognized actuarial gain	(28)
Net periodic pension expense (benefit)	$ 33	$ 66