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EMPLOYEE BENEFIT PLANS - Changes in plan assets and benefit obligations (Details) - Defined Benefit Pension Items - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
OTHER CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OTHER COMPREHENSIVE LOSS |  |  |
Net (gain) loss | $ (1,934) | $ 4,106 | $ (7,153)
Recognized loss | (37) | (3,828) | (4,157)
Total recognized in other comprehensive loss before tax effect | (1,971) | 278 | (11,310)
Total recognized in net benefit cost and other comprehensive loss before tax effect | $ (3,165) | $ 2,794 | $ (8,559)

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