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Significant Customers (Tables)
 6 Months Ended
Jun. 30, 2016
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:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2016
 
2015
 
2016
 
2015
HFC
 
83
%
 
82
%
 
82
%
 
81
%
Alon
 
9
%
 
10
%
 
8
%
 
10
%