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Financing Arrangements and Debt (Tables) | 12 Months Ended
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Dec. 31, 2023
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) | 2023 |  | 2022
Notes payable |  |  |
5.75% notes, due August 2025 | $ | – |  |  | $ | 248,675 |
5.875% notes, due December 2027 | 443,249 |  |  | 543,249 |
6.375% notes, due July 2028 | 372,226 |  |  | 451,934 |
7.05% notes, due May 2029 | 179,708 |  |  | 250,000 |
5.875% notes, due December 2042 ¹ | 339,761 |  |  | 339,761 |
Total notes payable | 1,334,944 |  |  | 1,833,619 |
Unamortized debt issuance cost and discount on notes payable | (10,107) |  |  | (15,324) |
Total notes payable, net of unamortized discount | 1,324,837 |  |  | 1,818,295 |
Capitalized lease obligation, due through March 2029 | 4,238 |  |  | 4,844 |
Total debt including current maturities | 1,329,075 |  |  | 1,823,139 |
Current maturities | (723) |  |  | (687) |
Total long-term debt | $ | 1,328,352 |  |  | $ | 1,822,452 |
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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