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Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Payables and Accruals [Abstract] |  |
Salaries and wages | $ 18,520 | $ 17,621
Accrual for compensated absences | 10,181 | 9,564
Employee benefits | 13,277 | 10,880
Pension liability - current portion | 2,057 | 2,110
Postretirement medical benefits - current portion | 4,195 | 4,660
Returns and allowances | 13,714 | 14,024
Interest | 1,218 | 942
Restructuring costs | 4,668 | 6,856
Dividends | 5,458 | 5,443
Workers' compensation | 2,053 | 2,086
Billings in excess of revenue recognized | 2,390 | 2,903
Professional fees | 3,068 | 2,093
Utilities | 991 | 779
Other | 13,405 | 11,824
Total | $ 95,195 | $ 91,785

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