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RETIREMENT BENEFIT PLANS (Scheduled of Funded Status) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Retirement Benefits [Abstract] |  |  |
Fair value of plan assets | $ 31,103 | $ 26,943 | $ 0
Benefit obligations | 52,542 | 47,661 | $ 668
Unfunded benefit obligations | $ 21,439 | $ 20,718 |

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