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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 154,913 | $ 110,242 | $ 304,106 | $ 213,099
Point in Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 145,998 |  | 288,003 |
Over Time [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 8,915 |  | 16,103 |
North America [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 75,375 | 51,557 | 152,991 | 101,723
Europe [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45,032 | 33,952 | 86,525 | 66,703
Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 25,502 | 16,545 | 45,650 | 28,443
Rest of World [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9,004 | 8,188 | 18,940 | 16,230
Parts and Consumables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 94,857 | 70,040 | 190,842 | 140,484
Capital [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 60,056 | 40,202 | 113,264 | 72,615
Operating Segment [Member] | Papermaking Systems [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 118,450 | 95,731 | 224,041 | 184,281
Operating Segment [Member] | Papermaking Systems [Member] | Stock preparation [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 56,376 | 46,178 | 101,859 | 87,331
Operating Segment [Member] | Papermaking Systems [Member] | Doctoring, Cleaning and Filtration [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 29,543 | 27,033 | 56,765 | 52,383
Operating Segment [Member] | Papermaking Systems [Member] | Fluid handling [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 32,531 | 22,520 | 65,417 | 44,567
Operating Segment [Member] | Wood Processing Systems Segment [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 33,152 | 11,393 | 72,293 | 21,336
Corporate And Reconciling Items [Member] | Fiber based Products [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 3,311 | $ 3,118 | $ 7,772 | $ 7,482

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