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Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Restructuring Cost [Line Items]        
Restructuring charges     $ 2,126  
Administrative consolidation costs [Member]
       
Restructuring Cost [Line Items]        
Restructuring charges 1,566 1,231 3,170 1,504
Cost of Sales [Member] | Facility Consolidation Costs [Member]
       
Restructuring Cost [Line Items]        
Restructuring charges 1,606 1,202 3,228 2,676
Other Expense [Member] | Administrative consolidation costs [Member]
       
Restructuring Cost [Line Items]        
Restructuring charges $ 1,566 $ 1,231 $ 3,170 $ 1,504