BENEFIT PLANS (Components of Net Periodic Benefit Cost- Pension Benefits) (Details) - Pension Benefits [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Components of Net Periodic Benefit Cost
Service cost	$ 1,331	$ 1,249
Interest cost	7,531	9,410
Expected return on plan assets	(12,485)	(11,938)
Amortization of prior service cost	335	335
Amortization of actuarial loss	3,140	1,358
Net periodic benefit cost (credit)	(148)	414
Pretax reclassification from AOCI included in net periodic pension benefit cost	$ 3,475	$ 1,693