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Revenues - Disaggregation of Revenue by Market Sector (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Disaggregation of Revenue [Line Items]    
Total revenue $ 67,696 $ 76,525
Test & Measurement    
Disaggregation of Revenue [Line Items]    
Total revenue 14,345 17,621
Avionics, Military & Space    
Disaggregation of Revenue [Line Items]    
Total revenue 6,160 8,115
Transportation    
Disaggregation of Revenue [Line Items]    
Total revenue 8,244 9,619
Other Markets    
Disaggregation of Revenue [Line Items]    
Total revenue 13,128 12,924
Industrial Weighing    
Disaggregation of Revenue [Line Items]    
Total revenue 12,467 14,437
General Industrial    
Disaggregation of Revenue [Line Items]    
Total revenue 4,039 5,622
Steel    
Disaggregation of Revenue [Line Items]    
Total revenue $ 9,313 $ 8,187