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v3.20.4

Financing Arrangements and Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt |
| December 31,
(Thousands of dollars) | 2020 |  | 2019
Notes payable |  |  |
4.00% notes, due June 2022 | $ | 259,291 |  |  | 260,251 |
4.95% notes, due December 2022 ¹ | 317,067 |  |  | 318,417 |
6.875% notes, due August 2024 | 542,428 |  |  | 550,000 |
5.75% notes, due August 2025 | 548,675 |  |  | 550,000 |
5.875% notes, due December 2027 | 543,249 |  |  | 550,000 |
7.05% notes, due May 2029 | 250,000 |  |  | 250,000 |
6.375% notes, due December 2042 ¹ | 349,000 |  |  | 350,000 |
Total notes payable | 2,809,710 |  |  | 2,828,668 |
Unamortized debt issuance cost and discount on notes payable | (21,643) |  |  | (25,287) |
Total notes payable, net of unamortized discount | 2,788,067 |  |  | 2,803,381 |
Senior Unsecured Revolving Credit Facility | 200,000 |  |  | — |
Total long-term debt | $ | 2,988,067 |  |  | 2,803,381 |
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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