Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Weighted-Average Assumptions used to Determine Benefit Obligations) (Details)

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BENEFIT PLANS (Weighted-Average Assumptions used to Determine Benefit Obligations) (Details)
Dec. 31, 2017
Dec. 31, 2016
Pension Benefits    
Weighted-average assumptions used to determine benefit obligations at December 31,    
Discount rate 3.73% 4.23%
Rate of compensation increase 4.88% 4.80%
Other Benefits    
Weighted-average assumptions used to determine benefit obligations at December 31,    
Discount rate 3.60% 3.98%