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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Long-term Debt | Long-term debt at December 31 was as follows:
| 2017 |  | 2016
| (Dollars in thousands)
Bank debt: |  |  |
Bank revolving loans | $ | — |  |  | $ | 99,500 |
U.S. term loans | 800,000 |  |  | 310,250 |
Canadian term loans | 27,147 |  |  | 44,274 |
Euro term loans | — |  |  | 196,668 |
Other foreign bank revolving and term loans | 76,798 |  |  | 120,500 |
Total bank debt | 903,945 |  |  | 771,192 |
5% Senior Notes | 280,000 |  |  | 500,000 |
5½% Senior Notes | 300,000 |  |  | 300,000 |
4¾% Senior Notes | 300,000 |  |  | — |
3¼% Senior Notes | 780,325 |  |  | — |
Total debt - principal | 2,564,270 |  |  | 1,571,192 |
Less unamortized debt issuance costs | 16,979 |  |  | 9,609 |
Total debt | 2,547,291 |  |  | 1,561,583 |
Less current portion | 108,789 |  |  | 217,127 |
| $ | 2,438,502 |  |  | $ | 1,344,456 |
Aggregate Annual Maturities of Debt | The aggregate annual maturities of our debt (non-U.S. dollar debt has been translated into U.S. dollars at exchange rates in effect at the balance sheet date) are as follows (dollars in thousands):
2018 | $ | 108,789 |
2019 | 86,509 |
2020 | 361,501 |
2021 | 83,620 |
2022 | 383,620 |
Thereafter | 1,540,231 |
| $ | 2,564,270 |
Redemption Price of Notes Plus Accrued and Unpaid Interest Thereon to Redemption Date |

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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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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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