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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2012
Property, Plant, and Equipment  
Summary of costs for property, plant, and equipment

 

 

 
   December 31,  
 
   2012   2011  
 
   (in thousands)
  

Land and improvements

   $ 30,992   $ 26,136  

Buildings

     40,617     37,289  

Machinery and equipment

     2,089,545     1,967,269  

Automotive equipment

     14,969     10,217  

Furniture and fixtures

     13,658     12,349  

Leasehold improvements

     2,483     1,445  

Railcars

     2,496     2,496  

Construction in progress

     189,291     94,085  
           

 

     2,384,051     2,151,286  

Accumulated depreciation

     601,133     478,325  
           

 

   $ 1,782,918   $ 1,672,961