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Additional Financial Statement Information (Tables) | 12 Months Ended
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Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Other Nonoperating Income (Expense) | The caption “Other” on the consolidated statements of operations consists of the following (in thousands):
| Years ended December 31,
| 2018 |  | 2017 |  | 2016
Foreign exchange gain (loss) | $ | (279 | ) |  | $ | (724 | ) |  | $ | 449 |
Interest income | 506 |  |  | 167 |  |  | 179 |
Pension expense | (1,682 | ) |  | (863 | ) |  | (556 | )
Other | (41 | ) |  | 1,337 |  |  | (246 | )
| $ | (1,496 | ) |  | $ | (83 | ) |  | $ | (174 | )
Schedule of Accrued Liabilities | Other accrued expenses consist of the following (in thousands):
| December 31,
| 2018 |  | 2017
Customer advance payments | $ | 5,328 |  |  | $ | 3,229 |
Accrued restructuring | 159 |  |  | 254 |
Goods received, not yet invoiced | 1,819 |  |  | 4,060 |
Accrued taxes, other than income taxes | 2,293 |  |  | 1,680 |
Accrued commissions | 2,203 |  |  | 1,694 |
Accrued professional fees | 1,775 |  |  | 1,731 |
Other | 3,454 |  |  | 3,304 |
| $ | 17,031 |  |  | $ | 15,952 |

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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