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Accounting Policies Income taxes (Details) (USD $)
In Thousands, unless otherwise specified
 2 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]        
Income tax expense $ 100us-gaap_IncomeTaxExpenseBenefit $ 132us-gaap_IncomeTaxExpenseBenefit $ 757us-gaap_IncomeTaxExpenseBenefit [1] $ (14,024)us-gaap_IncomeTaxExpenseBenefit [1]
Tax benefit from conversion to Partnership   $ 0dkl_TaxbenefitfromconversiontoPartnership $ 0dkl_TaxbenefitfromconversiontoPartnership $ 18,534dkl_TaxbenefitfromconversiontoPartnership
[1] Adjusted to include the historical results of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.