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Business Segments (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Segment
Sep. 30, 2011
Dec. 31, 2011
Business Segments          
Number of reportable segments     2    
Business Segments          
Net sales $ 2,409,624,000 $ 1,351,964,000 $ 6,686,573,000 $ 3,966,945,000  
Cost of product sold (exclusive of depreciation and amortization) 1,702,452,000 1,026,040,000 5,211,817,000 3,086,237,000  
Direct operating expenses (exclusive of depreciation and amortization) 109,929,000 74,615,000 319,542,000 209,256,000  
Insurance recovery - business interruption   (490,000)   (3,360,000)  
Depreciation and amortization 33,109,000 22,025,000 97,411,000 66,079,000  
Operating income (loss) 533,744,000 212,190,000 910,024,000 539,716,000  
Capital expenditures 39,894,000 25,652,000 145,053,000 46,631,000  
Total assets 3,652,377,000   3,652,377,000   3,119,291,000
Goodwill 40,969,000   40,969,000   40,969,000
Petroleum
          
Business Segments          
Intercompany sales 2,400,000 3,900,000 7,300,000 8,800,000  
Intercompany cost of product sold (exclusive of depreciation and amortization) 200,000 5,500,000 5,800,000 10,800,000  
Net sales 2,337,354,000 1,284,407,000 6,465,378,000 3,772,348,000  
Cost of product sold (exclusive of depreciation and amortization) 1,694,019,000 1,024,509,000 5,190,839,000 3,077,555,000  
Direct operating expenses (exclusive of depreciation and amortization) 88,890,000 54,510,000 253,176,000 143,974,000  
Depreciation and amortization 27,458,000 16,990,000 80,355,000 50,872,000  
Operating income (loss) 507,470,000 179,815,000 891,222,000 469,042,000  
Capital expenditures 20,211,000 20,216,000 82,604,000 33,430,000  
Total assets 2,188,950,000   2,188,950,000   2,322,148,000
Nitrogen Fertilizer
          
Business Segments          
Intercompany sales 300,000 5,700,000 6,000,000 11,800,000  
Intercompany cost of product sold (exclusive of depreciation and amortization) 2,500,000 3,400,000 7,800,000 7,000,000  
Cost of product sold related to the transfer of excess hydrogen 100,000 300,000 200,000 1,000,000  
Net sales 75,013,000 77,203,000 234,720,000 215,253,000  
Cost of product sold (exclusive of depreciation and amortization) 11,297,000 10,901,000 34,620,000 28,138,000  
Direct operating expenses (exclusive of depreciation and amortization) 21,063,000 20,083,000 66,424,000 65,373,000  
Insurance recovery - business interruption   (490,000)   (3,360,000)  
Depreciation and amortization 5,230,000 4,663,000 15,826,000 13,948,000  
Operating income (loss) 32,347,000 37,514,000 99,820,000 93,626,000  
Capital expenditures 18,201,000 4,492,000 57,419,000 10,539,000  
Total assets 653,242,000   653,242,000   659,309,000
Goodwill 40,969,000   40,969,000   40,969,000
Other
          
Business Segments          
Direct operating expenses (exclusive of depreciation and amortization) (24,000) 22,000 (58,000) (91,000)  
Depreciation and amortization 421,000 372,000 1,230,000 1,259,000  
Operating income (loss) (6,073,000) (5,139,000) (81,018,000) (22,952,000)  
Capital expenditures 1,482,000 944,000 5,030,000 2,662,000  
Total assets 810,185,000   810,185,000   137,834,000
Intersegment elimination
          
Business Segments          
Net sales (2,743,000) (9,646,000) (13,525,000) (20,656,000)  
Cost of product sold (exclusive of depreciation and amortization) $ (2,864,000) $ (9,370,000) $ (13,642,000) $ (19,456,000)