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Significant Customers (Tables)
 12 Months Ended
Dec. 31, 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:
 
Years Ended December 31,
 
2016
 
2015
 
2014
HFC
83
%
 
81
%
 
83
%
Alon
8
%
 
10
%
 
10
%