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Financing Arrangements and Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Long-term Debt | ໿
﻿ | December 31,
(Thousands of dollars) | 2019 |  | 2018
Notes payable |  |  |
4.00% notes, due June 2022 | $ | 260,251 |  |  | 500,000 |
4.45% notes, due December 2022 ¹ | 318,417 |  |  | 600,000 |
6.875% notes, due August 2024 | 550,000 |  |  | 550,000 |
5.75% notes, due August 2025 | 550,000 |  |  | 550,000 |
5.875% notes, due December 2027 | 550,000 |  |  | — |
7.05% notes, due May 2029 | 250,000 |  |  | 250,000 |
5.875% notes, due December 2042 ¹ | 350,000 |  |  | 350,000 |
Total notes payable | 2,828,668 |  |  | 2,800,000 |
Unamortized debt issuance cost and discount on notes payable | (25,287 | ) |  | (23,627 | )
Total notes payable, net of unamortized discount | 2,803,381 |  |  | 2,776,373 |
Capitalized lease obligation, due through March 2029 ¹ | — |  |  | 8,613 |
Total debt including current maturities | 2,803,381 |  |  | 2,784,986 |
Senior Unsecured Revolving Credit Facility | — |  |  | 325,000 |
Current maturities ² | — |  |  | (668 | )
Total long-term debt | $ | 2,803,381 |  |  | 3,109,318 |
1 Coupon rate may fluctuate 25 basis points if rating is periodically downgraded or upgraded by S&P and Moody’s. 2 Capitalized lease obligation and current maturities relate to a finance lease in Brunei, which is classified as held for sale as of December 31, 2019 (see Note E).

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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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