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Financing Arrangements and Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Financing Arrangements and Long-Term Debt [Abstract] |
Schedule of Long-term Debt |
﻿ |  |  |  |
﻿ | December 31,
﻿(Thousands of dollars) | 2018 |  | 2017
﻿Notes payable |  |  |  |
﻿ 4.00% notes, due June 2022 | $ | 500,000 |  | 500,000
﻿ 4.45% notes, due December 2022 1 |  | 600,000 |  | 600,000
﻿ 6.875% notes, due August 2024 |  | 550,000 |  | 550,000
﻿ 5.75% notes, due August 2025 |  | 550,000 |  | 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 |  | 2,800,000 |  | 2,800,000
﻿ Unamortized debt issuance cost and discount on notes payable |  | (23,627) |  | (27,433)
﻿ Total notes payable, net of unamortized discount |  | 2,776,373 |  | 2,772,567
﻿Capitalized lease obligation, due through March 2029 |  | 136,344 |  | 143,855
﻿ Total debt including current maturities |  | 2,912,717 |  | 2,916,422
﻿Senior Unsecured Revolving Credit Facility |  | 325,000 |  | -
﻿Current maturities |  | (10,583) |  | (9,902)
﻿ Total long-term debt | $ | 3,227,134 |  | 2,906,520
1 Due to a series of ratings changes by credit agencies, the paying interest rates on the notes due December 2022 and December 2042 decreased from 4.7% to 4.45% and 6.125% to 5.875%, respectively, in 2017 and remained through 2018.

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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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