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Long-Term Debt (Tables) | 9 Months Ended
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Sep. 30, 2018
Debt Disclosure [Abstract] |
Long-Term Debt |
|  | September 30, |  |  | December 31, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2017 |
|  | (Dollars in Thousands) |
6.60% Senior Notes, due 2018 |  | $ | — |  |  | $ | 299,871 |  |  | $ | 299,774 |
7% Debentures, due 2025 |  |  | 124,249 |  |  |  | 124,180 |  |  |  | 124,157 |
6.25% Senior Notes, due 2037 |  |  | 228,079 |  |  |  | 228,033 |  |  |  | 228,018 |
4.25% Senior Notes, due 2024 |  |  | 396,251 |  |  |  | 395,814 |  |  |  | 395,673 |
4.250% Senior Notes, due 2047 |  |  | 591,499 |  |  |  | 591,688 |  |  |  | — |
3.500% Senior Notes, due 2027 |  |  | 494,643 |  |  |  | 494,352 |  |  |  | — |
3.450% Senior Notes, due 2027 |  |  | 296,861 |  |  |  | 296,628 |  |  |  | 296,551 |
Floating Rate Senior Notes, due 2019, interest rate of 2.84% and 2.13% at September 30, 2018 and December 31, 2017, respectively |  |  | 299,074 |  |  |  | 298,102 |  |  |  | — |
Floating Rate Notes, due 2020, interest rate of 2.96%, 2.10% and 1.96% at September 30, 2018, December 31, 2017 and September 30, 2017, respectively |  |  | 298,773 |  |  |  | 298,227 |  |  |  | 298,046 |
Revolving Facility, due 2022, interest rate of 3.29% at September 30, 2018 |  |  | 100,000 |  |  |  | — |  |  |  | — |
Trade Receivable Facility, interest rate of 2.83% and 1.96% at September 30, 2018 and 2017, respectively |  |  | 380,000 |  |  |  | — |  |  |  | 80,000 |
Other notes |  |  | 269 |  |  |  | 308 |  |  |  | 321 |
Total debt |  |  | 3,209,698 |  |  |  | 3,027,203 |  |  |  | 1,722,540 |
Less: Current maturities of long-term debt and short-term facilities |  |  | (380,041 | ) |  |  | (299,909 | ) |  |  | (80,038 | )
Long-term debt |  | $ | 2,829,657 |  |  | $ | 2,727,294 |  |  | $ | 1,642,502 |

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