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Net Income Per Unit - Narrative (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Feb. 25, 2016
Limited Partners' Capital Account [Line Items]          
General partner's ownership interest (as percent) 2.00% 2.00% 2.00% 2.00%  
Subordinated unitholders - Delek [Member]          
Limited Partners' Capital Account [Line Items]          
Common units outstanding (in shares)         11,999,258