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Additional Financial Statement Information (Other) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Foreign exchange loss | $ (1,638) | $ (279) | $ (724)
Interest income | 622 | 506 | 167
Pension expense | (643) | (1,682) | (863)
Other | 958 | (41) | 1,337
Other nonoperating income (expense) | $ (701) | $ (1,496) | $ (83)

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