EMPLOYEE BENEFIT PLANS (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) plan	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 51	$ 47
Interest cost	19	29
Amortization of prior service cost	56	55
Amortization of gain	(38)	(34)
Net periodic benefit cost	$ 88	$ 97
Defined Benefit Plan Disclosure [Line Items]
Number of savings plan | plan	2
Benefit obligation	$ 1,146		$ 1,076
Deferred compensation liability	3,314		1,982
Related rabbi trust assets	3,314		1,982
Maximum
Defined Benefit Plan Disclosure [Line Items]
Historical cash payments for retirement medical plan claims per year	$ 100
Postretirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	2
Defined Benefit Pension Plan | Chemogas
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 623		$ 596