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Revenue Recognition Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 118,021 | $ 105,686 | $ 231,551 | $ 205,840
Aerospace and Defense [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 6,024 | 4,675 | 11,127 | 9,332
Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,773 | 19,214 | 43,129 | 36,326
Medical [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,793 | 7,474 | 19,034 | 14,288
Telecommunications & IT [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 5,525 | 5,602 | 10,050 | 10,780
Transportation [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 73,906 | $ 68,721 | $ 148,211 | $ 135,114

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