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Business Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Segment
Jun. 30, 2012
Jun. 29, 2013
Segment
Jun. 30, 2012
Segment
Business Segment Information [Abstract]        
Number of reportable segments 1   1 1
Revenues by Product line [Abstract]        
Revenues $ 82,165 $ 82,982 $ 158,369 $ 167,095
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income 8,425 9,415 15,797 19,805
Interest expense, net (89) (122) (145) (237)
Income from Continuing Operations Before Provision for Income Taxes 8,336 9,293 15,652 19,568
Capital Expenditures [Abstract]        
Capital expenditures 1,394 583 2,572 841
Papermaking Systems
        
Revenues by Product line [Abstract]        
Revenues 79,253 79,961 151,650 160,111
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income 11,821 11,772 21,765 23,876
Capital Expenditures [Abstract]        
Capital expenditures 1,226 503 2,398 761
Fiber based Products [Member]
        
Revenues by Product line [Abstract]        
Revenues 2,912 3,021 6,719 6,984
Corporate and Fiber-based Products [Member]
        
Income from Continuing Operations Before Provision for Income Taxes [Abstract]        
Total operating income (3,396) [1] (2,357) [1] (5,968) [1] (4,071) [1]
Capital Expenditures [Abstract]        
Capital expenditures $ 168 $ 80 $ 174 $ 80
[1] Corporate primarily includes general and administrative expenses.