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Commitments and Contingencies Crude Oil Releases (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Loss Contingencies [Line Items]
Pipeline release liabilities	$ 1,899,000dkl_Pipelinereleaseliabilitiescurrent	$ 0dkl_Pipelinereleaseliabilitiescurrent	[1]
Haynesville Crude Oil Release [Member]
Loss Contingencies [Line Items]
Pipeline release liabilities	600,000dkl_Pipelinereleaseliabilitiescurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_HaynesvilleCrudeOilReleaseMember
Maximum Exposure for Environmental Remediation under Omnibus Agreement	1,000,000dkl_MaximumExposureForEnvironmentalRemediationUnderOmnibusAgreement / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_HaynesvilleCrudeOilReleaseMember
Magnolia Station Spill [Member]
Loss Contingencies [Line Items]
Pipeline release liabilities	0dkl_Pipelinereleaseliabilitiescurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MagnoliaStationSpillMember
Maximum Exposure for Environmental Remediation under Omnibus Agreement	300,000dkl_MaximumExposureForEnvironmentalRemediationUnderOmnibusAgreement / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MagnoliaStationSpillMember
Macedonia Crude Oil Release [Member]
Loss Contingencies [Line Items]
Pipeline release liabilities	1,300,000dkl_Pipelinereleaseliabilitiescurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MacedoniaCrudeOilReleaseMember
Maximum Exposure for Environmental Remediation under Omnibus Agreement	300,000dkl_MaximumExposureForEnvironmentalRemediationUnderOmnibusAgreement / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MacedoniaCrudeOilReleaseMember
Operating Expense [Member] | Haynesville Crude Oil Release [Member]
Loss Contingencies [Line Items]
Cost incurred for environmental remediation	1,000,000dkl_Costincurredforenvironmentalremediation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_HaynesvilleCrudeOilReleaseMember
Operating Expense [Member] | Magnolia Station Spill [Member]
Loss Contingencies [Line Items]
Cost incurred for environmental remediation	0dkl_Costincurredforenvironmentalremediation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MagnoliaStationSpillMember	300,000dkl_Costincurredforenvironmentalremediation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MagnoliaStationSpillMember
Operating Expense [Member] | Macedonia Crude Oil Release [Member]
Loss Contingencies [Line Items]
Cost incurred for environmental remediation	$ 0dkl_Costincurredforenvironmentalremediation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MacedoniaCrudeOilReleaseMember	$ 300,000dkl_Costincurredforenvironmentalremediation / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = dkl_MacedoniaCrudeOilReleaseMember
[1] Includes the historical balances of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.

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