EMPLOYEE BENEFIT PLANS - Schedule of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Postretirement Medical Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 23	$ 29
Interest cost	13	18
Amortization of gain (loss)	(14)	(3)
Net periodic benefit cost	22	44
Defined Benefit Pension Plans | Chemogas Defined Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	57	49
Interest cost	26	19
Amortization of gain (loss)	3	1
Expected return on plan assets	(17)	(14)
Net periodic benefit cost	$ 69	$ 55