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Revenues - Disaggregation of Revenue by Market Sector (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]      
Revenue $ 299,794 $ 254,350 $ 224,929
Test & Measurement      
Disaggregation of Revenue [Line Items]      
Revenue 76,735 64,798 53,691
Avionics, Military & Space      
Disaggregation of Revenue [Line Items]      
Revenue 26,743 22,378 19,801
Medical      
Disaggregation of Revenue [Line Items]      
Revenue 9,868 8,769 8,459
Precision Weighing      
Disaggregation of Revenue [Line Items]      
Revenue 93,734 81,439 84,455
Force Measurement      
Disaggregation of Revenue [Line Items]      
Revenue 66,551 53,503 39,975
Steel      
Disaggregation of Revenue [Line Items]      
Revenue $ 26,163 $ 23,463 $ 18,548