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Significant Customers (Tables)
 12 Months Ended
Dec. 31, 2014
Risks and Uncertainties [Abstract]  
Schedules of Concentration of Risk, by Risk Factor
The following table presents the percentage of total revenues generated by each of these customers:
 
Years Ended December 31,
 
2014
 
2013
 
2012
HFC
83
%
 
83
%
 
84
%
Alon
10
%
 
11
%
 
11
%