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Equity Cash distributions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Nov. 14, 2014 | Oct. 24, 2014 | Aug. 14, 2014 | May 14, 2014 | Feb. 13, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 13, 2015 | Jan. 27, 2015
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly cash distribution (dollars per unit) |  | $ 0.490 us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit | $ 0.475 us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit | $ 0.425 us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit | $ 0.415 us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit |  |  |  |  |  |  |
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit |  | $ 1.96 dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit | $ 1.90 dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit | $ 1.70 dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit | $ 1.66 dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit |  |  |  |  |  |  |
Cash Distributions Paid | $ 12,394 us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid |  | $ 11,910 us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid | $ 10,474 us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid | $ 10,228 us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid |  |  |  |  |  |  |
General partner's distributions |  |  |  |  |  | 938 us-gaap_GeneralPartnersCapitalAccountDistributionAmount | 785 us-gaap_GeneralPartnersCapitalAccountDistributionAmount |  | 110 us-gaap_GeneralPartnersCapitalAccountDistributionAmount |  |  |
General partner's IDRs |  |  |  |  |  | 945 us-gaap_IncentiveDistributionDistributionPerYear | 0 us-gaap_IncentiveDistributionDistributionPerYear |  | 0 us-gaap_IncentiveDistributionDistributionPerYear |  |  |
Total general partner's distributions |  |  |  |  |  | 1,883 dkl_GeneralPartnersCapitalAccountPeriodDistributionAmountincludingIDRs | 785 dkl_GeneralPartnersCapitalAccountPeriodDistributionAmountincludingIDRs |  | 110 dkl_GeneralPartnersCapitalAccountPeriodDistributionAmountincludingIDRs |  |  |
Limited partners' distribution |  |  |  |  |  | 45,951 us-gaap_LimitedPartnersCapitalAccountDistributionAmount | 38,491 us-gaap_LimitedPartnersCapitalAccountDistributionAmount |  | 5,376 us-gaap_LimitedPartnersCapitalAccountDistributionAmount |  |  |
Total cash distributions |  |  |  |  |  | 47,834 dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared | 39,276 dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared |  | 5,486 dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared |  |  |
Cash distributions per limited partner unit |  |  |  |  |  | $ 1.900 us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit | $ 1.600 us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit | [1] | $ 0.224 us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit | [1] |  |
Common Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  | 23,152 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_LimitedPartnersCapitalAccountByClassAxis = dkl_CommonUnitsMember | 19,292 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_LimitedPartnersCapitalAccountByClassAxis = dkl_CommonUnitsMember |  | 2,688 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_LimitedPartnersCapitalAccountByClassAxis = dkl_CommonUnitsMember |  |  |
Subordinated Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Limited partners' distribution |  |  |  |  |  | 22,799 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_LimitedPartnersCapitalAccountByClassAxis = dkl_SubordinatedUnitsMember | 19,199 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_LimitedPartnersCapitalAccountByClassAxis = dkl_SubordinatedUnitsMember |  | 2,688 us-gaap_LimitedPartnersCapitalAccountDistributionAmount / us-gaap_LimitedPartnersCapitalAccountByClassAxis = dkl_SubordinatedUnitsMember |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Quarterly cash distribution (dollars per unit) |  |  |  |  |  |  |  |  |  |  | $ 0.510 us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit |  |  |  |  |  |  |  |  |  |  | $ 2.04 dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Cash Distributions Declared |  |  |  |  |  |  |  |  |  |  |  | $ 13,056 us-gaap_DistributionMadeToLimitedPartnerCashDistributionsDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
[1] | Adjusted to include the historical results of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.

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