RETIREMENT PLANS - Net Periodic Pension Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Components of the plan's net periodic pension cost
Settlements			$ 369	$ 1,725
Pension benefits
Components of the plan's net periodic pension cost
Service cost	$ 38	$ 57	113	171
Interest cost	593	565	1,780	1,695
Expected return on plan assets	(953)	(925)	(2,858)	(2,775)
Settlements			369	1,725
Net periodic pension expense (benefit)	(322)	(303)	(596)	816
Postretirement benefits
Components of the plan's net periodic pension cost
Service cost	31	36	62	108
Interest cost	35	33	70	99
Net periodic pension expense (benefit)	$ 66	$ 69	$ 132	$ 207