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Nature of Operations and Summary of Significant Accounting Policies - Revenue Recognition by Product Line, Product Type, Geography and Revenue Recognition Method (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 173,504 | $ 165,745 | $ 521,985 | $ 469,851
Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 151,101 | 148,524 | 457,093 | 436,527
Over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 22,403 | 17,221 | 64,892 | 33,324
North America |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 92,041 | 74,089 | 291,584 | 227,080
Europe |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 49,146 | 44,912 | 131,944 | 131,437
Asia |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20,971 | 32,887 | 61,745 | 78,537
Rest of World |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 11,346 | 13,857 | 36,712 | 32,797
Parts and Consumables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 105,513 | 92,749 | 330,280 | 283,591
Capital |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 67,991 | $ 72,996 | $ 191,705 | $ 186,260

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