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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Long-term Debt | Long-term debt at December 31 was as follows:
| 2018 |  | 2017
| (Dollars in thousands)
Bank debt: |  |  |
Bank revolving loans | $ | — |  |  | $ | — |
U.S. term loans | 800,000 |  |  | 800,000 |
Canadian term loans | 22,103 |  |  | 27,147 |
Other foreign bank revolving and term loans | 129,697 |  |  | 76,798 |
Total bank debt | 951,800 |  |  | 903,945 |
5% Senior Notes | — |  |  | 280,000 |
5½% Senior Notes | 300,000 |  |  | 300,000 |
4¾% Senior Notes | 300,000 |  |  | 300,000 |
3¼% Senior Notes | 744,380 |  |  | 780,325 |
Other obligations | 21,543 |  |  | — |
Total debt - principal | 2,317,723 |  |  | 2,564,270 |
Less unamortized debt issuance costs | 13,109 |  |  | 16,979 |
Total debt | 2,304,614 |  |  | 2,547,291 |
Less current portion | 170,214 |  |  | 108,789 |
| $ | 2,134,400 |  |  | $ | 2,438,502 |
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):
2019 | $ | 170,214 |
2020 | 84,548 |
2021 | 83,185 |
2022 | 383,257 |
2023 | 83,336 |
Thereafter | 1,513,183 |
| $ | 2,317,723 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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