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EMPLOYEE BENEFIT PLANS - Accumulated Benefit Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Retirement Benefits [Abstract] |  |
Projected benefit obligation | $ 100,469 | $ 90,261
Accumulated benefit obligation | 100,469 | 90,261
Fair value of plan assets | $ 78,883 | $ 66,460

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