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EMPLOYEE BENEFIT PLANS (Details 4)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ACCUMULATED BENEFIT OBLIGATION      
Discount rate 3.65% 4.00% 4.00%
NET BENEFIT COST      
Discount rate 4.70% 4.05% 4.45%
Expected return on plan assets 7.00% 7.00% 7.00%