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Related Party Transactions - Common Units Issued to Circle K as Consideration for Amounts Due Under the Terms of the Circle K Omnibus Agreement (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Common Units Issued To C S T As Consideration For Amounts Due Under Terms Of Omnibus Agreement [Abstract]    
Number of Common Units Issued 292,118 550,516