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Property, Plant, and Equipment (Tables)
 3 Months Ended
Mar. 31, 2013
Property, Plant, and Equipment  
Summary of costs for property, plant, and equipment

 

 
   March 31,
2013		   December 31,
2012		  
 
   (in thousands)
  

Land and improvements

   $ 32,179   $ 30,992  

Buildings

     41,349     40,617  

Machinery and equipment

     2,231,587     2,089,545  

Automotive equipment

     15,904     14,969  

Furniture and fixtures

     13,815     13,658  

Leasehold improvements

     2,483     2,483  

Railcars

     2,496     2,496  

Construction in progress

     77,907     189,291  
           

 

     2,417,720     2,384,051  

Accumulated depreciation

     635,076     601,133  
           

 

   $ 1,782,644   $ 1,782,918