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Property, Plant and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
                 
     2012     2011  

Land and land improvements

  $ 5,006     $ 4,974  

Buildings

    43,411       41,433  

Machinery and equipment

    237,473       224,426  

Construction-in-process

    7,493       12,446  

Other

    8,674       8,419  
      302,057       291,698  

Accumulated depreciation

    (151,760     (141,458
    $     150,297     $     150,240