XML 179 R27.htm IDEA: XBRL DOCUMENT v3.10.0.1
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 12 Months Ended
Dec. 31, 2018
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 period indicated:
 
 
Accumulated Other Comprehensive Loss
 
 
(Thousands of dollars)
January 1, 2017
 
$
(4,715
)
Pension and other postemployment benefit plans obligations
 
 
Other comprehensive loss before reclassification, net of tax of $808
 
(1,293
)
Amounts reclassified from accumulated other comprehensive income, net of tax of $(322)
 
515

Other comprehensive loss
 
(778
)
December 31, 2017
 
(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
)
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 period indicated:
 
 
 
 
 
 
 
Affected Line Item in the
Details about Accumulated Other Comprehensive
 
Years Ended December 31,
Consolidated Statements of
Loss Components
 
2018
 
2017
 
2016
Income
 
 
(Thousands of dollars)
 
Pension and other postemployment benefit plan obligations (a)
 
 
 
 
 
 
 
Amortization of net loss
 
$
43,800

 
$
42,591

 
$
40,912

 
Amortization of unrecognized prior service cost
 
(4,567
)
 
(4,597
)
 
(3,316
)
 
 
 
39,233

 
37,994

 
37,596

 
Regulatory adjustments (b)
 
(38,151
)
 
(37,157
)
 
(36,845
)
 
 
 
1,082

 
837

 
751

Income before income taxes
 
 
(271
)
 
(322
)
 
(289
)
Income tax expense
Total reclassifications for the period
 
$
811

 
$
515

 
$
462

Net income
(a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 12 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 9 for additional information regarding our regulatory assets and liabilities.