EMPLOYEE BENEFIT PLANS - Changes in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Postretirement Medical Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,374	$ 1,076
Initial adoption of new plan	0	0
Service cost with interest to end of year	87	68	$ 63
Interest cost	23	26	39
Participant contributions	28	23
Benefits paid	(426)	(27)
Actuarial gain	207	208
Benefit obligation at end of year	1,293	1,374	1,076
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Employer (reimbursement)/contributions	398	4
Participant contributions	28	23
Benefits paid	(426)	(27)
Fair value of plan assets at end of year	0	0	0
Pension Plan | Chemogas Defined Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,053	1,738
Service cost with interest to end of year	67	104	0
Interest cost	14	20	0
Participant contributions	24	21
Benefits paid	(18)	(11)
Actuarial gain	(127)	18
Exchange rate changes	(154)	163
Benefit obligation at end of year	1,859	2,053	1,738
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,103	895
Actual return on plan assets	76	57
Employer (reimbursement)/contributions	73	57
Participant contributions	24	21
Benefits paid	(18)	(11)
Exchange rate changes	(83)	84
Fair value of plan assets at end of year	$ 1,175	$ 1,103	$ 895