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Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016
Goodwill [Roll Forward] |  |
Gross Balance, Beginning Balance | $ 236,964 | $ 204,560
Accumulated impairment losses | (85,509) | (85,509)
Net Balance, Beginning Balance | 151,455 | 119,051
Increase Due to Acquisition | 101,881 | 38,552
Currency Translation | 14,665 | (6,148)
Goodwill period adjustments | 116,546 | 32,404
Gross Balance, Ending Balance | 353,510 | 236,964
Accumulated impairment losses | (85,509) | (85,509)
Net Balance, Ending Balance | 268,001 | 151,455
Stock-Preparation |  |
Goodwill [Roll Forward] |  |
Net Balance, Beginning Balance | 54,751 |
Net Balance, Ending Balance | 60,275 | 54,751
Doctoring, Cleaning, & Filtration |  |
Goodwill [Roll Forward] |  |
Net Balance, Beginning Balance | 33,839 |
Net Balance, Ending Balance | 35,941 | 33,839
Fluid-Handling |  |
Goodwill [Roll Forward] |  |
Net Balance, Beginning Balance | 45,600 |
Net Balance, Ending Balance | 65,289 | 45,600
Operating Segments | Papermaking systems segment |  |
Goodwill [Roll Forward] |  |
Gross Balance, Beginning Balance | 219,699 | 187,720
Accumulated impairment losses | (85,509) | (85,509)
Net Balance, Beginning Balance | 134,190 | 102,211
Increase Due to Acquisition | 16,373 | 38,552
Currency Translation | 10,942 | (6,573)
Goodwill period adjustments | 27,315 | 31,979
Gross Balance, Ending Balance | 247,014 | 219,699
Accumulated impairment losses | (85,509) | (85,509)
Net Balance, Ending Balance | 161,505 | 134,190
Operating Segments | Wood Processing Systems |  |
Goodwill [Roll Forward] |  |
Gross Balance, Beginning Balance | 17,265 | 16,840
Accumulated impairment losses | 0 | 0
Net Balance, Beginning Balance | 17,265 | 16,840
Increase Due to Acquisition | 85,508 | 0
Currency Translation | 3,723 | 425
Goodwill period adjustments | 89,231 | 425
Gross Balance, Ending Balance | 106,496 | 17,265
Accumulated impairment losses | 0 | 0
Net Balance, Ending Balance | $ 106,496 | $ 17,265

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