EMPLOYEE BENEFIT PLANS - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Weighted Average Assumptions Used in Calculating Benefit Obligation
Discount rate	2.50%	2.70%
Inflation	3.10%	3.30%
Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost
Discount rate	2.70%	4.00%
Expected long-term return on plan assets	4.50%	4.90%
Inflation	3.30%	2.80%