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Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Payables And Accruals [Abstract] |
Composition of Accrued Liabilities | The composition of accrued liabilities was as follows:
|  | December 31 |
(In thousands) |  | 2017 |  |  | 2016 |
Accrued payroll and benefits |  | $ | 58,877 |  |  | $ | 66,575 |
Accrued customer rebates |  |  | 16,729 |  |  |  | 18,553 |
Other accrued liabilities |  |  | 17,170 |  |  |  | 25,667 |
Total accrued liabilities |  | $ | 92,776 |  |  | $ | 110,795 |

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