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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Components of Net Periodic Benefit Cost
Service cost	$ 1,248	$ 1,429	$ 3,746	$ 4,287
Interest cost	9,410	8,876	28,230	26,627
Expected return on plan assets	(11,938)	(14,797)	(35,813)	(44,391)
Amortization of prior service cost	335	335	1,005	1,005
Amortization of actuarial loss	1,358	2,457	4,074	7,370
Net periodic benefit cost (credit)	413	(1,700)	1,242	(5,102)
Pretax reclassification from AOCI included in net periodic pension benefit cost	$ 1,693	$ 2,792	$ 5,079	$ 8,375