EMPLOYEE BENEFITS - Schedule of Actuarial Assumptions (Details)	Dec. 31, 2017	Dec. 31, 2016
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Compensation/Progression Rate		3.50%
Pension Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.43%	4.01%
Compensation/Progression Rate	3.50%
Pension Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.75%	4.33%
Compensation/Progression Rate	4.00%
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Discount Rate		4.21%
Other Postretirement Benefits Plan | Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.55%
Other Postretirement Benefits Plan | Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount Rate	3.70%