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Financing Arrangements and Debt (Tables) | 12 Months Ended
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Dec. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt | Long-term debt for the respective periods presented consisted of the following:
| December 31,
(Thousands of dollars) | 2024 |  | 2023
Notes payable |  |  |
5.875% notes, due December 2027 | $ | 78,899 |  |  | $ | 443,249 |
6.375% notes, due July 2028 | 148,590 |  |  | 372,226 |
7.05% notes, due May 2029 | 117,582 |  |  | 179,708 |
6.00% notes, due October 2032 | 600,000 |  |  | — |
5.875% notes, due December 2042 ¹ | 339,761 |  |  | 339,761 |
Total notes payable | 1,284,832 |  |  | 1,334,944 |
Unamortized debt issuance cost and discount on notes payable | (14,336) |  |  | (10,107) |
Total notes payable, net of unamortized discount | 1,270,496 |  |  | 1,324,837 |
Finance lease obligations, due through November 2034 | 4,877 |  |  | 4,238 |
Total debt including current maturities | 1,275,373 |  |  | 1,329,075 |
Current maturities | (871) |  |  | (723) |
Total long-term debt | $ | 1,274,502 |  |  | $ | 1,328,352 |
1 Coupon rate may fluctuate 25 basis points if rating is periodically downgraded or upgraded by S&P and Moody’s.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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