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EMPLOYEE RETIREMENT PLANS - Benefit Payments Expected to be Paid (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Benefit payments currently expected to be paid [Abstract]  
2021 $ 3,777
2022 4,288
2023 4,618
2024 4,618
2025-2029 28,400
Thereafter $ 25,800