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BENEFIT PLANS, Weighted-average Assumptions Used to Determine Benefit Obligations (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits [Member]    
Weighed average assumption used in calculating benefit obligations [Abstract]    
Discount rate 3.50% 4.50%
Expected return on plan assets 7.00% 7.00%
Rate of compensation increase 3.50% 3.50%
Post-retirement Benefits [Member]    
Weighed average assumption used in calculating benefit obligations [Abstract]    
Discount rate 3.60% 4.45%