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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Segment
Jun. 29, 2013
Business Segment Information [Abstract]        
Number of reportable segments     2  
Revenues by Product line [Abstract]        
Revenues $ 104,835 $ 82,165 $ 198,202 $ 158,369
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income 12,036 8,425 19,657 15,797
Interest expense, net (168) (89) (252) (145)
Income from Continuing Operations Before Provision for Income Taxes 11,868 8,336 19,405 15,652
Capital Expenditures [Abstract]        
Capital expenditures 903 1,394 1,442 2,572
Fiber based Products [Member]
        
Revenues by Product line [Abstract]        
Revenues 3,023 2,912 6,933 6,719
Corporate and Fiber-based Products [Member]
        
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income (3,262) [1] (3,396) [1] (6,405) [1] (5,968) [1]
Other [Member]
        
Capital Expenditures [Abstract]        
Capital expenditures 131 168 153 174
Operating Segment [Member] | Papermaking Systems
        
Revenues by Product line [Abstract]        
Revenues 91,975 79,253 170,159 151,650
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income 13,803 11,821 23,213 21,765
Capital Expenditures [Abstract]        
Capital expenditures 772 1,226 1,289 2,398
Operating Segment [Member] | Wood Processing Systems [Member]
        
Revenues by Product line [Abstract]        
Revenues 9,837 0 21,110 0
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income $ 1,495 $ 0 $ 2,849 $ 0
[1] Corporate primarily includes general and administrative expenses.