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Major Customer Major Customer	12 Months Ended
Major Customer Major Customer	Dec. 31, 2017
Major Customer [Abstract]
Major Customer	Major Customers Delek, directly or indirectly, accounted for 28.9%, 32.8% and 25.9% of our total revenues for the years ended December 31, 2017, 2016 and 2015, respectively. Sunoco LP accounted for 9.0%, 10.5% and 16.2% of our total revenues for the years ended December 31, 2017, 2016 and 2015, respectively.