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

Building and improvements

  $ 57,435     $ 57,512  

Machinery and equipment

    218,359       224,611  

Furniture and fixtures

    1,999       2,445  

Forklifts and tractors

    5,373       5,095  

Computer equipment

    7,371       5,774  

Construction in process

    1,855       2,425  

Land

    8,858       8,858  
   

 

 

   

 

 

 
      301,250       306,720  

Accumulated depreciation

    (196,825     (191,508
   

 

 

   

 

 

 

Total property, plant and equipment, net

  $ 104,425     $ 115,212