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Nature of Operations and Summary of Significant Accounting Policies - Goodwill (Details)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
USD ($)
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance $ 343,683
Accumulated impairment losses (85,509)
Net Balance, Beginning Balance 258,174
Acquisition 86,502
Currency translation (908)
Total 2019 adjustments 85,594
Gross Balance, Ending Balance 429,277
Accumulated impairment losses (85,509)
Net Balance, Ending Balance 343,768
Operating Segment | Papermaking Systems  
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance 241,912
Accumulated impairment losses (85,509)
Net Balance, Beginning Balance 156,403
Acquisition 0
Currency translation (1,031)
Total 2019 adjustments (1,031)
Gross Balance, Ending Balance 240,881
Accumulated impairment losses (85,509)
Net Balance, Ending Balance 155,372
Operating Segment | Wood Processing Systems  
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance 101,771
Accumulated impairment losses 0
Net Balance, Beginning Balance 101,771
Acquisition 0
Currency translation 123
Total 2019 adjustments 123
Gross Balance, Ending Balance 101,894
Accumulated impairment losses 0
Net Balance, Ending Balance 101,894
Operating Segment | Material Handling Systems  
Goodwill [Roll Forward]  
Gross Balance, Beginning Balance 0
Accumulated impairment losses 0
Net Balance, Beginning Balance 0
Acquisition 86,502
Currency translation 0
Total 2019 adjustments 86,502
Gross Balance, Ending Balance 86,502
Accumulated impairment losses 0
Net Balance, Ending Balance $ 86,502