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EMPLOYEE RETIREMENT PLANS - Benefit Payments Expected to be Paid (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Benefit payments currently expected to be paid [Abstract]  
2020 $ 3,551
2021 3,640
2022 4,122
2023 4,427
2024-2028 25,977
Thereafter $ 23,647