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Acquisitions Pro Forma Infromation (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
North Little Rock Terminal [Member]
    
Business Acquisition [Line Items]    
Net sales, Actual $ 200,000  
Net income (loss), Actual 100,000  
Net sales 908,867,000 1,024,025,000
Net income 42,268,000 26,109,000
Hopewell [Member]
    
Business Acquisition [Line Items]    
Net sales, Actual 400,000  
Net income (loss), Actual (500,000)  
Net sales 908,382,000 1,023,540,000
Net income 41,291,000 25,132,000
Big Sandy Terminal [Member]
    
Business Acquisition [Line Items]    
Net sales, Actual 1,500,000  
Net income (loss), Actual 1,200,000  
Nettleton Pipeline [Member]
    
Business Acquisition [Line Items]    
Net sales, Actual 9,000,000  
Net income (loss), Actual 7,200,000  
Nettleton and Big Sandy [Member]
    
Business Acquisition [Line Items]    
Net sales   1,022,715,000
Net income   $ 24,941,000