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Long-Term Debt (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Long-Term Debt |
|  | June 30, |  |  | December 31, |  |  | June 30, |
|  | 2018 |  |  | 2017 |  |  | 2017 |
|  | (Dollars in Thousands) |
6.60% Senior Notes, due 2018 |  | $ | — |  |  | $ | 299,871 |  |  | $ | 299,676 |
7% Debentures, due 2025 |  |  | 124,225 |  |  |  | 124,180 |  |  |  | 124,134 |
6.25% Senior Notes, due 2037 |  |  | 228,063 |  |  |  | 228,033 |  |  |  | 228,003 |
4.25% Senior Notes, due 2024 |  |  | 396,104 |  |  |  | 395,814 |  |  |  | 395,532 |
4.250% Senior Notes, due 2047 |  |  | 591,457 |  |  |  | 591,688 |  |  |  | — |
3.500% Senior Notes, due 2027 |  |  | 494,522 |  |  |  | 494,352 |  |  |  | — |
3.450% Senior Notes, due 2027 |  |  | 296,783 |  |  |  | 296,628 |  |  |  | 296,456 |
Floating Rate Senior Notes, due 2019, interest rate of 2.82% and 2.13% at June 30, 2018 and December 31, 2017, respectively |  |  | 298,889 |  |  |  | 298,102 |  |  |  | — |
Floating Rate Notes, due 2020, interest rate of 2.98%, 2.10% and 1.82% at June 30, 2018, December 31, 2017 and June 30, 2017, respectively |  |  | 298,590 |  |  |  | 298,227 |  |  |  | 297,847 |
Revolving Facility, due 2022, interest rate of 3.19% at June 30, 2018 |  |  | 170,000 |  |  |  | — |  |  |  | — |
Trade Receivable Facility, interest rate of 2.71% and 1.78% at June 30, 2018 and 2017, respectively |  |  | 320,000 |  |  |  | — |  |  |  | 140,000 |
Other notes |  |  | 289 |  |  |  | 308 |  |  |  | 333 |
Total debt |  |  | 3,218,922 |  |  |  | 3,027,203 |  |  |  | 1,781,981 |
Less: Current maturities of long-term debt and short-term facilities |  |  | (320,046 | ) |  |  | (299,909 | ) |  |  | (140,037 | )
Long-term debt |  | $ | 2,898,876 |  |  | $ | 2,727,294 |  |  | $ | 1,641,944 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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