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Revenues - Disaggregation of Revenue by Market Sector (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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- Definition 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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