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BENEFIT PLANS, Estimated Future Benefit Payments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Pension Benefits [Member]  
Estimated Future Benefit Payments [Abstract]  
2018 $ 8,702
2019 9,163
2020 9,404
2021 9,943
2022 10,378
2023-2027 56,064
Post-retirement Benefits [Member]  
Estimated Future Benefit Payments [Abstract]  
2018 145
2019 142
2020 139
2021 136
2022 133
2023-2027 $ 618