BENEFIT PLANS (Components of Net Periodic Benefit Cost- Other Postretirement Benefits) (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of Net Periodic Benefit Cost
Service cost	$ 265	$ 380	$ 795	$ 1,140
Interest cost	107	242	319	727
Amortization of prior service credit	(476)	(980)	(1,429)	(2,939)
Amortization of actuarial gain	(367)	(201)	(1,101)	(604)
Net periodic benefit credit	(471)	(559)	(1,416)	(1,676)
Pretax reclassifications from AOCI included in net periodic postretirement benefit credit	$ (843)	$ (1,181)	$ (2,530)	$ (3,543)