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Business Segment Information - Summary of Segment Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Sep. 30, 2017 USD ($) Segment | Oct. 01, 2016 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |
Number of reportable segments | Segment |  |  | 2 |  |
Revenues: |  |  |  |  |
Revenues | $ 152,794 | $ 105,519 | $ 365,893 | $ 313,885 |
Income Before Provision for Income Taxes: |  |  |  |  |
Total operating income (loss) | 19,458 | 12,561 | 42,947 | 34,898 |
Interest expense, net | (1,188) | (251) | (1,722) | (739) |
Income Before Provision for Income Taxes | 18,270 | 12,310 | 41,225 | 34,159 |
Capital Expenditures: |  |  |  |  |
Capital expenditures | 5,283 | 1,843 | 8,718 | 3,579 |
Total Assets: |  |  |  |  |
Total Assets | 787,659 |  | 787,659 |  | $ 470,691
Acquisition transaction costs |  |  | 5,002 |  |
Operating Segment [Member] | Papermaking Systems [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 111,135 | 96,078 | 295,416 | 280,436 |
Income Before Provision for Income Taxes: |  |  |  |  |
Total operating income (loss) | 21,544 | 16,915 | 52,932 | 44,747 |
Capital Expenditures: |  |  |  |  |
Capital expenditures | 3,790 | 1,632 | 6,567 | 3,341 |
Total Assets: |  |  |  |  |
Total Assets | 492,071 |  | 492,071 |  | 407,538
Acquisition transaction costs | 278 | 114 | 593 | 3,491 |
Operating Segment [Member] | Wood Processing Systems [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | 39,714 | 7,962 | 61,050 | 25,437 |
Income Before Provision for Income Taxes: |  |  |  |  |
Total operating income (loss) | 4,418 | 2,150 | 6,196 | 5,406 |
Total Assets: |  |  |  |  |
Total Assets | 259,487 |  | 259,487 |  | 52,407
Acquisition transaction costs | 4,625 |  | 8,727 |  |
Corporate and Fiber-based Products [Member] |  |  |  |  |
Income Before Provision for Income Taxes: |  |  |  |  |
Total operating income (loss) | (6,504) | (6,504) | (16,181) | (15,255) |
Capital Expenditures: |  |  |  |  |
Capital expenditures | 1,493 | 211 | 2,151 | 238 |
Total Assets: |  |  |  |  |
Total Assets | 36,101 |  | 36,101 |  | $ 10,746
Corporate and Fiber-based Products [Member] | Fiber-Based Products [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues | $ 1,945 | $ 1,479 | $ 9,427 | $ 8,012 |

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