EMPLOYEE BENEFIT PLANS (Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Rate of Compensation Increase (in percentage)	2.80%	3.00%	3.00%
Expected Return on Plan Assets	7.00%	7.00%	7.00%
Pension Benefits | Service cost
Defined Benefit Plan Disclosure [Line Items]
Discount Rate (in percentage)	4.40%	4.80%	4.20%
Pension Benefits | Interest Cost
Defined Benefit Plan Disclosure [Line Items]
Discount Rate (in percentage)	3.70%	3.90%	4.20%
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected Return on Plan Assets	7.00%	7.00%	7.00%
Other Postretirement Benefits | Service cost
Defined Benefit Plan Disclosure [Line Items]
Discount Rate (in percentage)	4.30%	4.60%	3.90%
Other Postretirement Benefits | Interest Cost
Defined Benefit Plan Disclosure [Line Items]
Discount Rate (in percentage)	3.30%	3.40%	3.90%