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Business Segment Information - Summary of Segment Information (Details) $ in Thousands | 3 Months Ended
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Apr. 01, 2017 USD ($) Segment | Apr. 02, 2016 USD ($)
Segment Reporting [Abstract] |  |
Number of reportable segments | Segment | 2 |
Revenues: |  |
Revenues | $ 102,857 | $ 96,538
Income Before Provision for Income Taxes: |  |
Total operating income | 12,046 | 10,093
Interest expense, net | (244) | (214)
Income Before Provision for Income Taxes | 11,802 | 9,879
Capital Expenditures: |  |
Capital expenditures | 1,722 | 524
Operating Segment [Member] | Papermaking Systems [Member] |  |
Revenues: |  |
Revenues | 88,550 | 84,027
Income Before Provision for Income Taxes: |  |
Total operating income | 14,258 | 13,497
Capital Expenditures: |  |
Capital expenditures | 1,484 | 518
Operating Segment [Member] | Wood Processing Systems [Member] |  |
Revenues: |  |
Revenues | 9,943 | 8,707
Income Before Provision for Income Taxes: |  |
Total operating income | 2,504 | 806
Corporate and Fiber-based Products [Member] |  |
Income Before Provision for Income Taxes: |  |
Total operating income | (4,716) | (4,210)
Capital Expenditures: |  |
Capital expenditures | 238 | 6
Corporate and Fiber-based Products [Member] | Fiber-Based Products [Member] |  |
Revenues: |  |
Revenues | $ 4,364 | $ 3,804

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