EMPLOYEE BENEFIT PLANS - Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Postretirement Medical Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,293	$ 1,374
Service cost with interest to end of year	79	87	$ 68
Interest cost	26	23	26
Participant contributions	27	28
Benefits paid	(69)	(426)
Actuarial loss	109	207
Benefit obligation at end of year	1,465	1,293	1,374
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	42	398
Participant contributions	27	28
Benefits paid	(69)	(426)
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	1,175
Fair value of plan assets at end of year	1,196	1,175
Pension Plan | Chemogas Defined Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,859	2,053
Service cost with interest to end of year	44	67	104
Interest cost	17	14	20
Participant contributions	27	24
Benefits paid	(60)	(18)
Actuarial loss	(194)	(127)
Exchange rate changes	(104)	(154)
Benefit obligation at end of year	1,589	1,859	2,053
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,175	1,103
Actual return on plan assets	26	76
Employer contributions	94	73
Participant contributions	27	24
Benefits paid	(60)	(18)
Exchange rate changes	(66)	(83)
Fair value of plan assets at end of year	$ 1,196	$ 1,175	$ 1,103