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Business Segment Information - Summary of Segment Information (Details)
 3 Months Ended
Mar. 31, 2018
USD ($)
Segment
Apr. 01, 2017
USD ($)
Segment Reporting [Abstract]    
Number of reportable segments | Segment 2  
Revenues:    
Revenues $ 149,193,000 $ 102,857,000
Income Before Provision for Income Taxes:    
Total operating income (loss) 16,664,000 12,250,000
Interest expense, net (1,549,000) (244,000)
Other expense, net (246,000) (204,000)
Income Before Provision for Income Taxes 14,869,000 11,802,000
Capital Expenditures:    
Capital expenditures 5,151,000 1,722,000
Restructuring costs 770,000 0
Operating Segment [Member] | Papermaking Systems [Member]    
Revenues:    
Revenues 105,591,000 88,550,000
Income Before Provision for Income Taxes:    
Total operating income (loss) 14,584,000 14,299,000
Capital Expenditures:    
Capital expenditures 4,649,000 1,484,000
Restructuring costs 770,000  
Operating Segment [Member] | Papermaking Systems [Member] | 2017 Acquisitions [Member]    
Revenues:    
Revenues 5,900,000  
Operating Segment [Member] | Wood Processing Systems [Member]    
Revenues:    
Revenues 39,141,000 9,943,000
Income Before Provision for Income Taxes:    
Total operating income (loss) 7,363,000 2,504,000
Capital Expenditures:    
Capital expenditures 376,000 186,000
Acquisition transaction costs 252,000 319,000
Operating Segment [Member] | Wood Processing Systems [Member] | 2017 Acquisitions [Member]    
Revenues:    
Revenues 28,870,000  
Corporate and Fiber-based Products [Member]    
Income Before Provision for Income Taxes:    
Total operating income (loss) (5,283,000) (4,553,000)
Capital Expenditures:    
Capital expenditures 126,000 52,000
Corporate and Fiber-based Products [Member] | Fiber based Products [Member]    
Revenues:    
Revenues $ 4,461,000 $ 4,364,000