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EMPLOYEE BENEFIT PLANS - Changes in plan assets and benefit obligations (Details) - Defined Benefit Pension Items [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
OTHER CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OTHER COMPREHENSIVE LOSS |  |  |
Net (gain) loss | $ 5,300 | $ 4,683 | $ (822)
Recognized loss | (1,649) | (1,548) | (1,454)
Total recognized in other comprehensive loss before tax effect | 3,651 | 3,135 | (2,276)
Total recognized in net benefit cost and other comprehensive loss before tax effect | $ 5,314 | $ 4,703 | $ (553)

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