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OTHER INCOME AND OTHER EXPENSE (Notes) | 6 Months Ended
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Jun. 30, 2026
Other Income and Other Expense Disclosure [Text Block] | OTHER INCOME AND OTHER EXPENSE The following table sets forth the components of other income and other expense for the periods indicated:
| Three Months Ended |  | Six Months Ended |
| June 30, |  | June 30, |
| 2026 |  | 2025 |  | 2026 |  | 2025 |  |  |
| (Thousands of dollars) |
Net periodic benefit (cost) credit other than service cost | $ | (972) |  |  | $ | 356 |  |  | $ | (2,125) |  |  | $ | 688 |  |  |  |
Gain (loss) on investments associated with nonqualified deferred compensation plans | 3,739 |  |  | 2,062 |  |  | 3,001 |  |  | 2,209 |  |  |  |
Unrealized gain (loss) on marketable equity securities | 372 |  |  | 184 |  |  | 250 |  |  | 184 |  |  |  |
Credit due to change in federal tax regulation for securitization (a) | 2,390 |  |  | — |  |  | 2,390 |  |  | — |  |  |  |
Other income (expense), net | (309) |  |  | (30) |  |  | (393) |  |  | 9 |  |  |  |
Total other income (expense), net | $ | 5,220 |  |  | $ | 2,572 |  |  | $ | 3,123 |  |  | $ | 3,090 |  |  |  |

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- Definition The entire disclosure for the components of non-operating income or non-operating expense, including, but not limited to, amounts earned from dividends, interest on securities, gain (loss) on securities sold, equity earnings of unconsolidated affiliates, gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 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(9)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration