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Acquisitions Purchase Price Allocation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 17, 2014
Oct. 01, 2014
Oct. 24, 2013
Jul. 19, 2013
FTT Assets          
Business Acquisition [Line Items]          
Property, Plant and Equipment [1]   $ 10,790      
Intangible Assets [1]   0      
Goodwill [1],[2]   549      
Inventory [1]   0      
Accounts Receivable [1]   1,767      
Accounts Payable [1]   (1,181)      
Total [1]   $ 11,925      
Footnote [Abstract]          
Additional Consideration Transferred $ 400        
Greenville-Mount Pleasant Assets          
Business Acquisition [Line Items]          
Property, Plant and Equipment [3]     $ 4,829    
Intangible Assets [3]     5,171    
Goodwill [2],[3]     0    
Inventory [3]     1,125    
Accounts Receivable [3]     0    
Accounts Payable [3]     0    
Total [3]     $ 11,125    
North Little Rock Terminal          
Business Acquisition [Line Items]          
Property, Plant and Equipment       $ 4,990  
Intangible Assets       10  
Goodwill [2]       0  
Inventory       0  
Accounts Receivable       0  
Accounts Payable       0  
Total       $ 5,000  
Hopewell          
Business Acquisition [Line Items]          
Property, Plant and Equipment         $ 3,538
Intangible Assets         984
Goodwill [2]         1,200
Inventory         0
Accounts Receivable         0
Accounts Payable         0
Total         $ 5,722
[1] During the fourth quarter of 2015, we finalized our purchase price allocation and adjusted certain of the acquisition-date fair values previously disclosed in connection with working capital adjustments and an additional $0.4 million of consideration paid for additional assets.
[2] All goodwill is expected to be deductible for tax purposes.
[3] During the third quarter of 2015, we finalized our purchase price allocation and adjusted certain of the acquisition-date fair values previously disclosed.