EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS - Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Service cost	$ 0	$ 0	$ 0
Interest cost	22	20	23
Expected return on plan assets	(35)	(30)	(27)
Amortization of prior service cost	0	0	0
Recognized net actuarial loss (gain)	8	19	16
Total net periodic benefit cost	(5)	9	12
Other Postretirement Benefits Plan
EMPLOYEE AND POSTRETIREMENT BENEFIT PLANS
Service cost	63	63	46
Interest cost	34	33	39
Expected return on plan assets	0	0	0
Amortization of prior service cost	(31)	(31)	(31)
Recognized net actuarial loss (gain)	(19)	(5)	(14)
Total net periodic benefit cost	$ 47	$ 60	$ 40