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EMPLOYEE RETIREMENT PLANS - Benefit Payments Expected to be Paid (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Benefit payments currently expected to be paid [Abstract]  
2018 $ 1,214
2019 2,548
2020 2,670
2021 2,756
2022 3,167
2023-2027 18,885
Thereafter $ 22,125