EMPLOYEE BENEFIT PLANS - Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Postretirement Medical Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,465	$ 1,293
Service cost with interest to end of year	108	79	$ 87
Interest cost	62	26	23
Participant contributions	23	27
Benefits paid	(30)	(69)
Actuarial (gain) loss	(233)	109
Benefit obligation at end of year	1,395	1,465	1,293
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Employer contributions	7	42
Participant contributions	23	27
Benefits paid	(30)	(69)
Fair value of plan assets at end of year	0	0	0
Pension Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,196
Fair value of plan assets at end of year	1,240	1,196
Pension Plan | Chemogas Defined Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,589	1,859
Service cost with interest to end of year	65	44	67
Interest cost	65	17	14
Participant contributions	0	27
Benefits paid	(188)	(60)
Actuarial (gain) loss	80	(194)
Exchange rate changes	49	(104)
Benefit obligation at end of year	1,660	1,589	1,859
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,196	1,175
Actual return on plan assets	56	26
Employer contributions	138	94
Participant contributions	0	27
Benefits paid	(188)	(60)
Exchange rate changes	38	(66)
Fair value of plan assets at end of year	$ 1,240	$ 1,196	$ 1,175