BENEFIT PLANS (Narrative) (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($) entity	Sep. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($) entity	Sep. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of funded, noncontributory defined benefit pension plans				3
Number of unfunded, nonqualified pension plans				3
Number of defined contribution plans	2			2
Normal retirement age				65 years
Expense recognized related to defined contribution plans | $	$ 13,646	$ 10,376		$ 41,246	$ 30,521
Discretionary Employer Contribution [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions | $			$ 100,000