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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)