XML 82 R33.htm IDEA: XBRL DOCUMENT
v3.24.0.1

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table sets forth the balance in accumulated other comprehensive loss for the periods indicated:
|  | Accumulated Other Comprehensive Income (Loss)
|  | (Thousands of dollars)
January 1, 2022 |  | $ | (6,527) |
Pension and other postemployment benefit plans obligations |  |
Other comprehensive income before reclassification, net of tax of $(1,669) |  | 5,701 |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax of $(36) |  | 122 |
Other comprehensive income |  | 5,823 |
December 31, 2022 |  | (704)
Pension and other postemployment benefit plans obligations |  |
Other comprehensive loss before reclassification, net of tax of $140 |  | (479) |
Amounts reclassified from accumulated other comprehensive income, net of tax of $— |  | 1 |
Other comprehensive loss |  | (478) |
December 31, 2023 |  | $ | (1,182) |
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:
|  |  |  | Years Ended |  | Affected Line Item in the
Details About Accumulated Other |  |  |  | December 31, |  | Consolidated Statements
Comprehensive Loss Components |  |  |  |  | 2023 | 2022 | 2021 |  | of Income
|  |  |  |  | (Thousands of dollars) |  |
Pension and other postemployment benefit plan obligations (a) |  |  |  |  |  |  |  |  |
Amortization of net loss |  |  |  |  | $ | 1,960 |  | $ | 17,010 |  | $ | 45,896 |  |  |
Amortization of unrecognized prior service cost |  |  |  |  | 525 |  | 289 |  | (279) |  |  |
|  |  |  |  | 2,485 |  | 17,299 |  | 45,617 |  |  |
Regulatory adjustments (b) |  |  |  |  | (2,484) |  | (17,141) |  | (44,055) |  |  |
|  |  |  |  | 1 |  | 158 |  | 1,562 |  |  | Income before income taxes
|  |  |  |  | — |  | (36) |  | (390) |  |  | Income tax expense
Total reclassifications for the period |  |  |  |  | $ | 1 |  | $ | 122 |  | $ | 1,172 |  |  | Net income
(a) These components of accumulated other comprehensive loss are included in the computation of net periodic benefit cost. See Note 11 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.

X
- References No definition available. + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration