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Business Segments (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Segment Reporting [Abstract]    
Number of reportable segments 2  
Petroleum
   
Segment Reporting Information [Line Items]    
Intercompany sales $ 2,300,000 $ 2,700,000
Intercompany cost of product sold (exclusive of depreciation and amortization) 5,900,000 29,000
Petroleum | Hydrogen
   
Segment Reporting Information [Line Items]    
Intercompany sales 0 200,000
Nitrogen Fertilizer
   
Segment Reporting Information [Line Items]    
Intercompany sales 5,900,000 29,000
Intercompany cost of product sold (exclusive of depreciation and amortization) 2,200,000 2,600,000
Cost of product sold related to the transfer of excess hydrogen $ 0 $ 200,000