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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Debt | Debt comprised the following at December 31, 2017 and 2016:
(In thousands) |  | Maturity Dates |  | December 31, 2017 |  |  | December 31, 2016 |
Unsecured private placement notes |  |  |  |  |  |  |  |  |  |
3.95% (net of unamortized debt issuance cost of $346 and $382 for 2017 and 2016, respectively) |  | 2021-2027 |  | $ | 99,654 |  |  | $ | 99,618 |
3.86% (net of unamortized debt issuance cost of $343 and $390 for 2017 and 2016, respectively) |  | 2019-2025 |  |  | 99,657 |  |  |  | 99,610 |
4.86% (net of unamortized debt issuance cost of $191 and $225 for 2017 and 2016, respectively) |  | 2018-2023 |  |  | 55,523 |  |  |  | 64,775 |
5.88% (net of unamortized debt issuance cost of $95 and $116 for 2017 and 2016, respectively) |  | 2018-2022 |  |  | 28,476 |  |  |  | 34,170 |
5.69% (net of unamortized debt issuance cost of $12 and $28 for 2017 and 2016, respectively) |  | 2018 |  |  | 5,703 |  |  |  | 11,400 |
Debt of foreign subsidiaries |  |  |  |  |  |  |  |  |  |
Unsecured bank debt, foreign currency |  | 2018 |  |  | 1,786 |  |  |  | 432 |
Secured bank debt, foreign currency |  | 2018 |  |  | — |  |  |  | 7,008 |
Total debt |  |  |  | $ | 290,799 |  |  | $ | 317,013 |
Less current maturities |  |  |  |  | 22,500 |  |  |  | 28,154 |
Long-term debt |  |  |  | $ | 268,299 |  |  | $ | 288,859 |
Schedule of Net Interest Expense | Net interest expense for the years ended December 31, 2017, 2016 and 2015, comprised the following:
(In thousands) |  | 2017 |  |  | 2016 |  |  | 2015 |
Interest expense |  | $ | 14,428 |  |  | $ | 15,240 |  |  | $ | 15,488 |
Interest income |  |  | (2,075 | ) |  |  | (1,247 | ) |  |  | (217 | )
|  |  | 12,353 |  |  |  | 13,993 |  |  |  | 15,271 |
Capitalized interest |  |  | (909 | ) |  |  | (788 | ) |  |  | (738 | )
Interest expense, net |  | $ | 11,444 |  |  | $ | 13,205 |  |  | $ | 14,533 |

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