BENEFIT PLANS (Components of Net Periodic Benefit Cost- Pension Benefits) (Details) - Pension Benefits [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of Net Periodic Benefit Cost
Service cost	$ 1,331	$ 1,249	$ 2,662	$ 2,498
Interest cost	7,531	9,410	15,062	18,820
Expected return on plan assets	(12,485)	(11,937)	(24,969)	(23,875)
Amortization of prior service cost	335	335	670	670
Amortization of actuarial loss	3,140	1,358	6,279	2,716
Net periodic benefit cost (credit)	(148)	415	(296)	829
Pretax reclassification from AOCI included in net periodic pension benefit cost	$ 3,475	$ 1,693	$ 6,949	$ 3,386