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Additional Financial Statement Information (Other) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other [Line Items] |  |  |
Foreign exchange gain (loss) | $ (279) | $ (724) | $ 449
Interest income | 506 | 167 | 179
Other income |  | 1,337 |
Other expenses | (41) |  | (246)
Other nonoperating income (expense) | (1,496) | (83) | (174)
Other Income (Expense) |  |  |
Other [Line Items] |  |  |
Pension expense | $ (1,682) | $ (863) | $ (556)

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