BENEFIT PLANS (Narrative) (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Jun. 30, 2019 USD ($) entity	Jun. 30, 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 | $	$ 13,681	$ 13,596		$ 27,600	$ 20,144
Discretionary Employer Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions | $			$ 100,000