BENEFIT PLANS (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) entity	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) entity	Sep. 30, 2019 USD ($)
BENEFIT PLANS [Abstract]
Number of funded, noncontributory defined benefit pension plans			3
Number of unfunded, nonqualified pension plans			3
Number of defined contribution plans	2		2
Number of union that continues to add new participants	2		2
Normal retirement age			65 years
Expense recognized related to defined contribution plans | $	$ 13,707	$ 13,646	$ 37,574	$ 41,246