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Related Party Transactions Omnibus Agreement (Details) (Omnibus Agreement [Member], General Partner, USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Feb. 10, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Omnibus Agreement [Member] | General Partner
Related Party Transaction [Line Items]
Omnibus Agreement Annual Amount		$ 3.3dkl_OmnibusAgreementAnnualAmount / us-gaap_RelatedPartyTransactionAxis = dkl_OmnibusAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember	$ 3.0dkl_OmnibusAgreementAnnualAmount / us-gaap_RelatedPartyTransactionAxis = dkl_OmnibusAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember
Payment for Administrative Fees		3.3us-gaap_PaymentForAdministrativeFees / us-gaap_RelatedPartyTransactionAxis = dkl_OmnibusAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember	2.8us-gaap_PaymentForAdministrativeFees / us-gaap_RelatedPartyTransactionAxis = dkl_OmnibusAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember	0.4us-gaap_PaymentForAdministrativeFees / us-gaap_RelatedPartyTransactionAxis = dkl_OmnibusAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember
Annual Maximum Tank Repair and Maintenance Expense	$ 0.5dkl_AnnualMaximumTankRepairAndMaintenanceExpense / us-gaap_RelatedPartyTransactionAxis = dkl_OmnibusAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_GeneralPartnerMember

X

- Definition

Annual Maximum Tank Repair and Maintenance Expense

+ References

No definition available.

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- Definition

Omnibus Agreement Annual Amount

+ References

No definition available.

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- Definition

Amount paid to managing member or general partner, affiliate of managing member or general partner, or affiliate of limited liability company (LLC) or limited partnership (LP) for administrative services provided to the LLC or LP, for example, but not limited to, salaries, rent, or overhead costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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