PENSION AND OTHER POSTRETIREMENT PLANS (Schedule of Assumptions Used in Calculating the Net Benefit Obligation) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net benefit obligation, Weighted average discount rate	3.46%	3.86%	3.96%
Lump sum assumed interest rates for First 5 years	2.05%	1.57%	1.61%
Lump sum assumed interest rates for Next 15 years	3.61%	3.45%	4.02%
Lump sum assumed interest rates for All future years	4.27%	4.39%	5.03%
Net pension expense, Weighted average discount rate	3.86%	3.96%	3.61%
Expected long-term rate of return	6.50%	7.00%	7.75%
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net benefit obligation, Weighted average discount rate	3.46%	3.86%	3.96%
Net pension expense, Weighted average discount rate	3.86%	3.96%	3.61%
Expected long-term rate of return	6.50%	7.00%	7.75%