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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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