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Financing Arrangements and Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Schedule of Long-term Debt | Long-term debt consisted of the following as of December 31, 2022 and 2021:
| December 31,
(Thousands of dollars) | 2022 |  | 2021
Notes payable |  |  |
6.875% notes, due August 2024 | $ | — |  |  | $ | 242,428 |
5.75% notes, due August 2025 | 248,675 |  |  | 548,675 |
5.875% notes, due December 2027 | 543,249 |  |  | 543,249 |
6.375% notes, due July 2028 | 451,934 |  |  | 550,000 |
7.05% notes, due May 2029 | 250,000 |  |  | 250,000 |
6.125% notes, due December 2042 ¹ | 339,761 |  |  | 349,000 |
Total notes payable | 1,833,619 |  |  | 2,483,352 |
Unamortized debt issuance cost and discount on notes payable | (15,324) |  |  | (22,773) |
Total notes payable, net of unamortized discount | 1,818,295 |  |  | 2,460,579 |
Capitalized lease obligation, due through March 2029 ¹ | 4,844 |  |  | 5,489 |
Total debt including current maturities | 1,823,139 |  |  | 2,466,068 |
Current maturities | (687) |  |  | (654) |
Total long-term debt | $ | 1,822,452 |  |  | $ | 2,465,414 |
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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