Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Weighted Average Assumptions (Details)

v3.8.0.1
BENEFIT PLANS - Weighted Average Assumptions (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits    
Weighted-average assumptions used to determine benefit obligations    
Discount rate 3.73% 4.38%
Weighted-average assumptions used to determine net periodic benefit cost    
Discount Rate 4.38% 4.54%
Long-term Return on Assets 6.50% 6.75%
Post-Retirement Benefits    
Weighted-average assumptions used to determine benefit obligations    
Discount rate 3.34% 3.64%
Weighted-average assumptions used to determine net periodic benefit cost    
Discount Rate 3.64% 3.81%