BENEFIT PLANS (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) entity	Mar. 31, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans | entity	3
Number of unfunded, nonqualified pension plans | entity	3
Normal retirement age	65 years
Expense recognized related to defined contribution plans | $	$ 13,919,000	$ 6,548,000
Discretionary Employer Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions | $		$ 100,000,000