BENEFIT PLANS (Components of Net Periodic Benefit Cost- Pension Benefits) (Details) - Pension Benefits [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Components of Net Periodic Benefit Cost
Service cost	$ 1,331	$ 1,248	$ 3,993	$ 3,746
Interest cost	7,531	9,410	22,593	28,230
Expected return on plan assets	(12,485)	(11,938)	(37,454)	(35,813)
Amortization of prior service cost	335	335	1,005	1,005
Amortization of actuarial loss	3,140	1,358	9,419	4,074
Net periodic benefit cost (credit)	(148)	413	(444)	1,242
Pretax reclassification from AOCI included in net periodic pension benefit cost	$ 3,475	$ 1,693	$ 10,424	$ 5,079