Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Weighted Average Assumptions (Details)

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BENEFIT PLANS - Weighted Average Assumptions (Details) - Pension Benefits
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Weighted-average assumptions used to determine benefit obligations    
Discount rate 4.41% 3.73%
Weighted-average assumptions used to determine net periodic benefit cost    
Discount Rate 3.73% 4.38%
Long-term Return on Assets 5.75% 6.50%