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EMPLOYEE BENEFIT PLANS - Weighted-average assumptions used to determine net periodic benefit cost (Details) - Defined Benefit Pension Items [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
WEIGHTED AVERAGE ASSUMPTIONS:      
Discount rate 4.28% 3.63% 4.12%
Expected return on plan assets 7.50% 7.50% 7.75%
Rate of compensation increase 2.50% 2.50% 2.50%