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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Components of Net Periodic Benefit Cost
Service cost	$ 329	$ 339	$ 988	$ 1,018
Interest cost	347	310	1,041	930
Amortization of prior service credit	(980)	(991)	(2,939)	(2,972)
Amortization of actuarial gain	(327)	(324)	(981)	(973)
Net periodic benefit cost (credit)	(631)	(666)	(1,891)	(1,997)
Pretax reclassifications from AOCI included in net periodic postretirement benefit credit	$ (1,307)	$ (1,315)	$ (3,920)	$ (3,945)