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Property, Plant, and Equipment (Tables)
 6 Months Ended
Jun. 30, 2012
Property, Plant, and Equipment  
Summary of costs for property, plant, and equipment

 

 

 
   June 30,
2012 		  December 31,
2011 		 
 
   (in thousands)
  

Land and improvements

   $ 27,674   $ 26,136  

Buildings

     37,583     37,289  

Machinery and equipment

     2,013,055     1,967,269  

Automotive equipment

     10,618     10,217  

Furniture and fixtures

     12,844     12,349  

Leasehold improvements

     1,979     1,445  

Railcars

     2,496     2,496  

Construction in progress

     135,006     94,085  
           

 

     2,241,255     2,151,286  

Accumulated depreciation

     539,950     478,325  
           

 

   $ 1,701,305   $ 1,672,961