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Discontinued Operations (Details) (Refined products segment [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Refined products segment [Member]
     
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues from discontinued operations $ 25,717,000 $ 169,412,000 $ 128,189,000
Operating income (loss) from discontinued operation   788,000  
Proceeds from sale of contracts and certain equipment 2,000,000    
Proceeds from sale of inventory 1,546,000    
Gain (loss) on disposal of discontinued operation 1,622,000    
Pre-tax earnings from discontinued operation $ 398,000