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EMPLOYEE BENEFIT PLANS - Schedule of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Amortization of loss $ 4 $ 0
Postretirement Medical Plans    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 54 39
Interest cost 31 13
Amortization of prior service cost 0 4
Net periodic benefit cost 85 56
Defined Benefit Pension Plans | Chemogas Defined Pension Plan    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]    
Service cost 32 29
Interest cost 32 12
Expected return on plan assets (21) (25)
Net periodic benefit cost $ 43 $ 16