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Property, Plant, and Equipment (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Property, Plant, and Equipment      
Gross property, plant and equipment $ 2,151,286,000 $ 1,470,721,000  
Accumulated depreciation 478,325,000 389,409,000  
Property, plant, and equipment, net of accumulated depreciation 1,672,961,000 1,081,312,000  
Capitalized interest 3,900,000 1,800,000 2,000,000
Original carrying value of assets under capital lease obligations 24,900,000 5,200,000  
Land and improvements
     
Property, Plant, and Equipment      
Gross property, plant and equipment 26,136,000 19,228,000  
Buildings
     
Property, Plant, and Equipment      
Gross property, plant and equipment 37,289,000 25,663,000  
Machinery and equipment
     
Property, Plant, and Equipment      
Gross property, plant and equipment 1,967,269,000 1,363,877,000  
Automotive equipment
     
Property, Plant, and Equipment      
Gross property, plant and equipment 10,217,000 8,747,000  
Furniture and fixtures
     
Property, Plant, and Equipment      
Gross property, plant and equipment 12,349,000 9,279,000  
Leasehold improvements
     
Property, Plant, and Equipment      
Gross property, plant and equipment 1,445,000 1,253,000  
Railcars
     
Property, Plant, and Equipment      
Gross property, plant and equipment 2,496,000    
Construction in progress
     
Property, Plant, and Equipment      
Gross property, plant and equipment $ 94,085,000 $ 42,674,000