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Additional Financial Statement Information (Tables)
 12 Months Ended
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