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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Notes) | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Comprehensive Income (Loss) Note | ACCUMULATED OTHER COMPREHENSIVE 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) |
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.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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