BENEFIT PLANS (Components of Net Periodic Benefit Cost- Other Postretirement Benefits) (Details) - Postretirement Benefits [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Components of Net Periodic Benefit Cost
Service cost	$ 339	$ 292	$ 1,018	$ 875
Interest cost	310	315	930	945
Amortization of prior service credit	(991)	(1,059)	(2,972)	(3,177)
Amortization of actuarial gain	(324)	(397)	(973)	(1,190)
Net periodic benefit cost (credit)	(666)	(849)	(1,997)	(2,547)
Pretax reclassification from AOCI included in net periodic pension/postretirement benefit cost (credit)	$ (1,315)	$ (1,456)	$ (3,945)	$ (4,367)