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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of net loss	$ 10,950	$ 10,648	$ 21,900	$ 21,296
Amortization of unrecognized prior service cost	(1,142)	(1,149)	(2,284)	(2,298)
Reclassification adjustment, before tax and regulatory adjustments	9,808	9,499	19,616	18,998
Regulatory adjustments	(9,537)	(9,289)	(19,074)	(18,579)
Reclassification adjustment, before tax	271	210	542	419
Reclassification adjustment, Tax	(68)	(81)	(419)	(161)
Reclassification adjustment, net of tax	$ 203	$ 129	$ 123	$ 258

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Other comprehensive income (loss) reclassification - Regulatory adjustments represent pension and other postretirement benefit costs expected to be recovered through rates and are deferred as part of our regulatory assets.

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Other comprehensive income (loss) reclassification adjustment, before tax and regulatory adjustments

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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