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EMPLOYEE BENEFIT PLANS - Amounts Recognized in Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Postretirement Medical Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated postretirement benefit obligation $ (1,374) $ (1,076)  
Fair value of plan assets 0 0 $ 0
Funded status (1,374) (1,076)  
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations) 1,374 1,076  
Pension Plan | Chemogas Defined Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated postretirement benefit obligation (2,053) (1,738)  
Fair value of plan assets 1,103 895 $ 0
Funded status (950) (843)  
Net amount recognized in consolidated balance sheet (after ASC 715) (included in other long-term obligations) $ 950 $ 596