BENEFIT PLANS (Components of Net Periodic Benefit Cost - Pension Benefits) (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of Net Periodic Benefit Cost
Service cost	$ 1,193	$ 1,331	$ 3,580	$ 3,993
Interest cost	4,879	7,531	14,638	22,593
Expected return on plan assets	(11,375)	(12,485)	(34,125)	(37,454)
Amortization of prior service cost	337	335	1,010	1,005
Amortization of actuarial loss	2,178	3,140	6,535	9,419
Net periodic benefit credit	(2,788)	(148)	(8,362)	(444)
Pretax reclassification from AOCI included in net periodic pension benefit cost	$ 2,515	$ 3,475	$ 7,545	$ 10,424