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EMPLOYEE BENEFIT PLANS - Estimated Future Employer Contributions and Benefit Payments (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Postretirement Medical Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 99
2022 98
2023 81
2024 100
2025 93
Years 2026-2030 495
Pension Plan | Chemogas Defined Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 2
2022 0
2023 0
2024 0
2025 0
Years 2026-2030 $ 25