BENEFIT PLANS (Narrative) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2017 entity	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans	3
Number of unfunded, nonqualified pension plans	3
Normal retirement age	65 years
Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Discretionary qualified plan contribution | $		$ 10,600,000