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Long-term Debt | 12 Months Ended
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Dec. 31, 2017
Financing Arrangements and Long-Term Debt [Abstract] |
Long-term Debt | Note G – Long-term Debt
﻿ |  |  |  |
﻿ |  |  |  |
﻿ | December 31,
﻿(Thousands of dollars) | 2017 |  | 2016
﻿Notes payable |  |  |  |
﻿ 3.50% notes, due December 2017 | $ | - |  | 550,000
﻿ 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 |  | -
﻿ 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 |  | (27,433) |  | (23,835)
﻿ Total notes payable, net of unamortized discount |  | 2,772,567 |  | 2,776,165
﻿Capitalized lease obligation, due through March 2029 |  | 143,855 |  | 216,402
﻿ Total debt including current maturities |  | 2,916,422 |  | 2,992,567
﻿Current maturities |  | (9,902) |  | (569,817)
﻿ Total long-term debt | $ | 2,906,520 |  | 2,422,750
﻿ 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, at December 2017. ﻿ The amount of debt repayable over each of the next five years and thereafter are as follows: $9.9 million in 2018, $10.4 million in 2019, $11.0 million in 2020, $11.5 million in 2021, $1.11 b illion in 2022 and $1.77 billion thereafter.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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