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Property, Plant, and Equipment (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Property, Plant, and Equipment      
Gross property, plant and equipment $ 2,201,656,000   $ 2,151,286,000
Accumulated depreciation 509,522,000   478,325,000
Property, plant, and equipment, net of accumulated depreciation 1,692,134,000   1,672,961,000
Capitalized interest 2,100,000 100,000  
Original carrying value of assets under capital lease obligations 25,100,000 300,000  
Land and improvements
     
Property, Plant, and Equipment      
Gross property, plant and equipment 26,673,000   26,136,000
Buildings
     
Property, Plant, and Equipment      
Gross property, plant and equipment 37,375,000   37,289,000
Machinery and equipment
     
Property, Plant, and Equipment      
Gross property, plant and equipment 1,992,653,000   1,967,269,000
Automotive equipment
     
Property, Plant, and Equipment      
Gross property, plant and equipment 10,621,000   10,217,000
Furniture and fixtures
     
Property, Plant, and Equipment      
Gross property, plant and equipment 12,664,000   12,349,000
Leasehold improvements
     
Property, Plant, and Equipment      
Gross property, plant and equipment 1,970,000   1,445,000
Railcars
     
Property, Plant, and Equipment      
Gross property, plant and equipment 2,496,000   2,496,000
Construction in progress
     
Property, Plant, and Equipment      
Gross property, plant and equipment $ 117,204,000   $ 94,085,000