EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Service cost	$ 0	$ 0	$ 0
Interest cost	31	22	20
Expected return on plan assets	(18)	(35)	(30)
Amortization of prior service cost	0	0	0
Recognized net actuarial loss (gain)	11	8	19
Settlement of plan obligation	21	0	0
Total net periodic benefit cost	45	(5)	9
Other Postretirement Benefits Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Service cost	54	63	63
Interest cost	48	34	33
Expected return on plan assets	0	0	0
Amortization of prior service cost	(31)	(31)	(31)
Recognized net actuarial loss (gain)	(36)	(19)	(5)
Settlement of plan obligation	0	0	0
Total net periodic benefit cost	$ 35	$ 47	$ 60