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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated:
 
 
Accumulated Other Comprehensive Loss
 
 
(Thousands of dollars)
January 1, 2018
 
$
(5,493
)
Pension and other postemployment benefit plans obligations
 
 
Other comprehensive income before reclassification, net of tax of $(577)
 
596

Amounts reclassified from accumulated other comprehensive loss, net of tax of $(271)
 
811

Other comprehensive income
 
1,407

December 31, 2018
 
(4,086
)
Pension and other postemployment benefit plans obligations
 
 
Other comprehensive loss before reclassification, net of tax of $692
 
(2,074
)
Amounts reclassified from accumulated other comprehensive loss, net of tax of $(213)
 
639

Other comprehensive loss
 
(1,435
)
Reclassification of stranded tax effects (a)
 
(1,218
)
December 31, 2019
 
$
(6,739
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table sets forth the effect of reclassifications from accumulated other comprehensive loss on our Consolidated Statements of Income for the periods indicated:
 
 
 
 
 
 
 
Affected Line Item in the
Details about Accumulated Other Comprehensive
 
Years Ended December 31,
Consolidated Statements of
Loss Components
 
2019
 
2018
 
2017
Income
 
 
(Thousands of dollars)
 
Pension and other postemployment benefit plan obligations (a)
 
 
 
 
 
 
 
Amortization of net loss
 
$
35,283

 
$
43,800

 
$
42,591

 
Amortization of unrecognized prior service cost
 
(673
)
 
(4,567
)
 
(4,597
)
 
 
 
34,610

 
39,233

 
37,994

 
Regulatory adjustments (b)
 
(33,758
)
 
(38,151
)
 
(37,157
)
 
 
 
852

 
1,082

 
837

Income before income taxes
 
 
(213
)
 
(271
)
 
(322
)
Income tax expense
Total reclassifications for the period
 
$
639

 
$
811

 
$
515

Net income
(a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 13 for additional information regarding 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 10 for additional information regarding our regulatory assets and liabilities.