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BENEFIT PLANS, Estimated Future Benefit Payments (Details) $ in Thousands | Dec. 31, 2017 USD ($)
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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

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