EMPLOYEE BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost with interest to end of year	$ 79	$ 87	$ 68
Interest cost	26	23	26
Amortization of prior service cost	9	74	74
Amortization of gain	(2)	(24)	(50)
Total net periodic benefit cost	112	160	118
Pension Plan | Chemogas Defined Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost with interest to end of year	44	67	104
Interest cost	17	14	20
Expected return on plan assets	(37)	(34)	(14)
Amortization of prior service cost	0	0	0
Amortization of gain	0	3	0
Total net periodic benefit cost	$ 24	$ 50	$ 110