ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of net loss	$ 2,278	$ 11,474	$ 14,731	$ 34,422
Amortization of unrecognized prior service cost	103	(70)	185	(210)
Reclassification adjustment, before tax and regulatory adjustments	2,381	11,404	14,916	34,212
Regulatory adjustments	(2,365)	(11,013)	(14,772)	(33,040)
Reclassification adjustment, before tax	16	391	144	1,172
Reclassification adjustment, Tax	(4)	(91)	(33)	(273)
Reclassification adjustment, net of tax	$ 12	$ 300	$ 111	$ 899