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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |
Fair Value Measurements, Recurring and Nonrecurring | The following tables summarize, by level within the fair value hierarchy, our derivative and other assets and liabilities that were accounted for at fair value on a recurring basis at December 31, 2023 and 2022:
| December 31, 2023
| Level 1 |  | Level 2 |  |  |  | Total
| (Thousands of dollars)
Assets: |  |  |  |  |  |  |
United States treasury notes (b) | $ | 6,496 |  |  | $ | — |  |  |  |  | $ | 6,496 |
Corporate bonds (b) | — |  |  | 11,080 |  |  |  |  | 11,080 |
Total assets | $ | 6,496 |  |  | $ | 11,080 |  |  |  |  | $ | 17,576 |
Liabilities: |  |  |  |  |  |  |
Derivative instruments - swaps (a) | $ | — |  |  | $ | 13,920 |  |  |  |  | $ | 13,920 |
(a) The fair value is included in other current assets and other current liabilities in our consolidated balance sheets. (b) The fair value is included in other current and noncurrent assets and other current and noncurrent liabilities in our consolidated balance sheets.
| December 31, 2022
| Level 1 |  | Level 2 |  | Total
| (Thousands of dollars)
Assets: |  |  |  |  |
United States treasury notes (b) | $ | 4,695 |  |  | $ | — |  |  | $ | 4,695 |
Corporate bonds (b) | — |  |  | 9,710 |  |  | 9,710 |
Total assets | $ | 4,695 |  |  | $ | 9,710 |  |  | $ | 14,405 |
(a) The fair value is included in other current assets and other current liabilities in our consolidated balance sheets. (b) The fair value is included in other current and noncurrent assets and other current and noncurrent liabilities in our consolidated balance sheets.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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