ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

6 Months Ended

Jun. 30, 2022

Accumulated Other Comprehensive Income (Loss) [Line Items]

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

The following table sets forth the effect of reclassifications from accumulated other comprehensive loss in our consolidated statements of income for the periods indicated:

	Three Months Ended				Six Months Ended				Affected Line Item in the
Details About Accumulated Other	June 30,				June 30,				Consolidated Statements
Comprehensive Loss Components	2022		2021		2022		2021		of Income
	(Thousands of dollars)
Pension and other postemployment benefit plan obligations (a)
Amortization of net loss	$	4,252	$	11,474	$	12,453	$	22,948
Amortization of unrecognized prior service cost (credit)	72		(70)		82		(140)
	4,324		11,404		12,535		22,808
Regulatory adjustments (b)	(4,265)		(11,014)		(12,388)		(22,027)
	59		390		147		781		Income before income taxes
	(15)		(91)		(34)		(182)		Income tax expense
Total reclassifications for the period	$	44	$	299	$	113	$	599	Net income

(a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 9 for additional detail of our net periodic benefit cost.

(b) Regulatory adjustments represent pension and other postemployment benefit costs expected to be recovered through rates and are deferred as part of our regulatory assets. See Note 3 for additional disclosures of regulatory assets and liabilities.