EMPLOYEE BENEFIT PLANS - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Postretirement Medical Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 28	$ 27
Interest cost	14	15
Amortization of (gain) loss	(3)	2
Net periodic benefit cost	39	44
Defined Benefit Pension Plans | Chemogas Defined Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	18	16
Interest cost	14	16
Expected return on plan assets	(10)	(10)
Net periodic benefit cost	$ 22	$ 22