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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)   $ 0.490us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.475us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit $ 0.415us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit          
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit   $ 1.96dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit $ 1.90dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit $ 1.70dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit $ 1.66dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit          
Cash Distributions Paid $ 12,394us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid   $ 11,910us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 10,474us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid $ 10,228us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid          
General partner's distributions           938us-gaap_GeneralPartnersCapitalAccountDistributionAmount 785us-gaap_GeneralPartnersCapitalAccountDistributionAmount 110us-gaap_GeneralPartnersCapitalAccountDistributionAmount    
General partner's IDRs           945us-gaap_IncentiveDistributionDistributionPerYear 0us-gaap_IncentiveDistributionDistributionPerYear 0us-gaap_IncentiveDistributionDistributionPerYear    
Total general partner's distributions           1,883dkl_GeneralPartnersCapitalAccountPeriodDistributionAmountincludingIDRs 785dkl_GeneralPartnersCapitalAccountPeriodDistributionAmountincludingIDRs 110dkl_GeneralPartnersCapitalAccountPeriodDistributionAmountincludingIDRs    
Limited partners' distribution           45,951us-gaap_LimitedPartnersCapitalAccountDistributionAmount 38,491us-gaap_LimitedPartnersCapitalAccountDistributionAmount 5,376us-gaap_LimitedPartnersCapitalAccountDistributionAmount    
Total cash distributions           47,834dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared 39,276dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared 5,486dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared    
Cash distributions per limited partner unit           $ 1.900us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit $ 1.600us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit [1] $ 0.224us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit [1]    
Common Units [Member]                    
Distribution Made to Limited Partner [Line Items]                    
Limited partners' distribution           23,152us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= dkl_CommonUnitsMember		 19,292us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= dkl_CommonUnitsMember		 2,688us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= dkl_CommonUnitsMember		    
Subordinated Units [Member]                    
Distribution Made to Limited Partner [Line Items]                    
Limited partners' distribution           22,799us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= dkl_SubordinatedUnitsMember		 19,199us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= dkl_SubordinatedUnitsMember		 2,688us-gaap_LimitedPartnersCapitalAccountDistributionAmount
/ us-gaap_LimitedPartnersCapitalAccountByClassAxis
= dkl_SubordinatedUnitsMember		    
Subsequent Event [Member]                    
Distribution Made to Limited Partner [Line Items]                    
Quarterly cash distribution (dollars per unit)                 $ 0.510us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Distribution Made To Member Or Limited Partner Distributions Paid Annualized Per Unit                 $ 2.04dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Cash Distributions Declared                   $ 13,056us-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.