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EMPLOYEE RETIREMENT PLANS - Benefit Payments Expected to be Paid (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Benefit payments currently expected to be paid [Abstract]  
2022 $ 5,945
2023 6,421
2024 6,421
2025 6,421
2026-2030 42,300
Thereafter $ 26,300