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DERIVATIVE FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS (Tables) | 6 Months Ended
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Jun. 30, 2026
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 June 30, 2026 and December 31, 2025:
| June 30, 2026
| Level 1 |  | Level 2 |  | Netting (c) |  | Total
| (Thousands of dollars)
Assets: |  |  |  |  |  |  |
United States treasury notes (b) | $ | 8,267 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,267 |
Corporate bonds (b) | — |  |  | 19,103 |  |  | — |  |  | 19,103 |
Marketable equity securities (d) | 2,877 |  |  | — |  |  | — |  |  | 2,877 |
Total assets | $ | 11,144 |  |  | $ | 19,103 |  |  | $ | — |  |  | $ | 30,247 |
Liabilities: |  |  |  |  |  |  |
Derivative instruments - swaps (a) | $ | — |  |  | $ | 624 |  |  | $ | (24) |  |  | $ | 600 |
(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 in our consolidated balance sheets. (c) Our over-the-counter natural gas fixed-price swaps are presented on a net basis when the right of offset exists. (d) The fair value is included in other current assets in our consolidated balance sheets.
| December 31, 2025 |  |
| Level 1 |  | Level 2 |  | Netting (c) |  | Total |  |
| (Thousands of dollars) |  |
Assets: |  |  |  |  |  |  |  |  |
United States treasury notes (b) | $ | 9,329 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,329 |  |  |
Corporate bonds (b) | — |  |  | 18,643 |  |  | — |  |  | 18,643 |  |  |
Marketable equity securities (d) | 2,627 |  |  | — |  |  | — |  |  | 2,627 |  |  |
Total assets | $ | 11,956 |  |  | $ | 18,643 |  |  | $ | — |  |  | $ | 30,599 |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Derivative instruments - swaps (a) | $ | — |  |  | $ | 7,309 |  |  | $ | — |  |  | $ | 7,309 |  |  |
(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 in our consolidated balance sheets. (c) Our over-the-counter natural gas fixed-price swaps are presented on a net basis when the right of offset exists. (d) The fair value is included in other current assets in our consolidated balance sheets.

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