Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS (Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost) (Details)

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BENEFIT PLANS (Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Discount rate 4.86% 4.26% 5.07%
Expected return on plan assets 7.14% 7.44% 7.43%
Rate of compensation increase 4.80% 4.71% 3.34%
Other Benefits      
Weighted-average assumptions used to determine net periodic benefit cost at December 31,      
Discount rate 4.39% 4.05% 4.49%
Expected return on plan assets 7.25% 7.50% 7.50%