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Business Segment Information - Summary of Segment Information (Details)
$ in Thousands
 3 Months Ended
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