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Partners' Capital (Common Unit Activity) (Details) - shares
 3 Months Ended 12 Months Ended
Jul. 21, 2015
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Limited Partners' Capital Account [Line Items]        
Common units issued in connection with ETP Dropdown (in shares)       5,710,922
Common units issued in connection with the PIPE Transaction (in shares)       2,263,158
Common Units [Member]        
Limited Partners' Capital Account [Line Items]        
Number of common units at beginning of year (in shares)   87,365,706   87,365,706
Common units issued in connection with the PIPE Transaction (in shares) 5,500,000 2,263,158    
Common units issued in connection with the ATM (in shares)     1,268,750 2,840,399
Partners' Capital Account, Units, Susser Buyout     22,390  
Phantom unit vesting (in shares)     195,813 861
Number of common units at end of year (in shares)     99,667,999