EMPLOYEE BENEFIT PLANS - Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Unrecognized prior service cost	$ 74	$ 74
Unrecognized net gain	(50)	(46)
Postretirement Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation	1,293	1,374
Fair value of plan assets	0	0	$ 0
Funded status	1,293	1,374
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations)	1,293	1,374
Pension Plan \| Chemogas Defined Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated postretirement benefit obligation	1,859	2,053
Fair value of plan assets	1,175	1,103	$ 895
Funded status	684	950
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations)	$ 684	$ 950

Amount of liability, recognized in statement of financial position, for defined benefit pension plan, classified as noncurrent. Excludes other postretirement benefit plan.

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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