BENEFIT PLANS (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) entity	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) entity	Jun. 30, 2020 USD ($)
BENEFIT PLANS [Abstract]
Number of funded, noncontributory defined benefit pension plans			2
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 | $	$ 12,885	$ 12,810	$ 35,022	$ 23,867