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Reportable Segment Data (Schedule of Restructuring Costs) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Pension settlement        
Pension settlement expense $ 110,560    $ 119,735   
Restructuring by segment        
Restructuring expense 3,152 1,731 3,410 1,765
Machine Clothing [Member]
       
Restructuring by segment        
Restructuring expense 2,903 572 3,576 605
Engineered Composites [Member]
       
Restructuring by segment        
Restructuring expense    44    57
Unallocated Expenses [Member]
       
Pension settlement        
Pension settlement expense 110,560    119,735   
Restructuring by segment        
Restructuring expense $ 249 $ 1,115 $ (166) $ 1,103