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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2011
Property, Plant, and Equipment  
Summary of costs for property, plant, and equipment

 

 

 
   December 31,  
 
   2011   2010  
 
   (in thousands)
  

Land and improvements

   $ 26,136   $ 19,228  

Buildings

     37,289     25,663  

Machinery and equipment

     1,967,269     1,363,877  

Automotive equipment

     10,217     8,747  

Furniture and fixtures

     12,349     9,279  

Leasehold improvements

     1,445     1,253  

Railcars

     2,496     —  

Construction in progress

     94,085     42,674  
           

 

     2,151,286     1,470,721  

Accumulated depreciation

     478,325     389,409  
           

 

   $ 1,672,961   $ 1,081,312