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EMPLOYEE BENEFIT PLANS (Details 4) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ACCUMULATED BENEFIT OBLIGATION |  |  |
Discount rate | 2.80% | 3.65% | 4.00%
NET BENEFIT COST |  |  |
Discount rate | 3.65% | 4.70% | 4.45%
Expected return on plan assets | 7.00% | 7.00% | 7.00%

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