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Business Segments (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
segment
Mar. 31, 2012
Dec. 31, 2012
Business Segments      
Number of reportable segments 2    
Business Segments      
Net sales $ 2,352,419,000 $ 1,968,631,000  
Cost of product sold (exclusive of depreciation and amortization) 1,813,582,000 1,635,155,000  
Direct operating expenses (exclusive of depreciation and amortization) 108,548,000 115,514,000  
Depreciation and amortization 34,198,000 32,112,000  
Operating income (loss) 367,662,000 140,508,000  
Capital expenditures 63,719,000 59,525,000  
Total assets 3,772,059,000   3,610,895,000
Goodwill 40,969,000   40,969,000
Petroleum
      
Business Segments      
Intercompany sales 2,700,000 2,400,000  
Intercompany cost of product sold (exclusive of depreciation and amortization) 29,000 5,700,000  
Net sales 2,274,018,000 1,898,485,000  
Cost of product sold (exclusive of depreciation and amortization) 1,805,774,000 1,630,665,000  
Direct operating expenses (exclusive of depreciation and amortization) 86,046,000 92,703,000  
Depreciation and amortization 27,951,000 26,259,000  
Operating income (loss) 335,600,000 134,896,000  
Capital expenditures 44,582,000 35,403,000  
Total assets 2,693,276,000   2,258,515,000
Petroleum | Hydrogen
      
Business Segments      
Intercompany sales 200,000 0  
Nitrogen Fertilizer
      
Business Segments      
Intercompany sales 29,000 5,700,000  
Intercompany cost of product sold (exclusive of depreciation and amortization) 2,600,000 3,000,000  
Cost of product sold related to the transfer of excess hydrogen 200,000 0  
Net sales 81,411,000 78,276,000  
Cost of product sold (exclusive of depreciation and amortization) 10,655,000 12,598,000  
Direct operating expenses (exclusive of depreciation and amortization) 22,557,000 22,837,000  
Depreciation and amortization 5,767,000 5,438,000  
Operating income (loss) 36,803,000 31,426,000  
Capital expenditures 18,063,000 22,274,000  
Total assets 660,113,000   622,954,000
Goodwill 40,969,000   40,969,000
Other
      
Business Segments      
Direct operating expenses (exclusive of depreciation and amortization) (55,000) (26,000)  
Depreciation and amortization 480,000 415,000  
Operating income (loss) (4,741,000) (25,814,000)  
Capital expenditures 1,074,000 1,848,000  
Total assets 418,670,000   729,426,000
Intersegment elimination
      
Business Segments      
Net sales (3,010,000) (8,130,000)  
Cost of product sold (exclusive of depreciation and amortization) $ (2,847,000) $ (8,108,000)