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Acquisitions Pro Forma Infromation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
FTT Assets |  |  |
Business Acquisition [Line Items] |  |  |
Total operating revenues contributed | $ 531 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = dkl_FTTAssetsMember |  |
Net income contributed | 122 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = dkl_FTTAssetsMember |  |
Net sales | 854,842 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_FTTAssetsMember | 921,017 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_FTTAssetsMember |
Net income | 71,820 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_FTTAssetsMember | 34,433 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_FTTAssetsMember |
Greenville-Mount Pleasant Assets |  |  |
Business Acquisition [Line Items] |  |  |
Total operating revenues contributed | 172 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = dkl_GreenvilleMt.PleasantAssetsMember |  |
Net income contributed | (109)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = dkl_GreenvilleMt.PleasantAssetsMember |  |
Net sales | 841,943 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_GreenvilleMt.PleasantAssetsMember | 908,118 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_GreenvilleMt.PleasantAssetsMember |
Net income | 70,617 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_GreenvilleMt.PleasantAssetsMember | 33,230 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_GreenvilleMt.PleasantAssetsMember |
North Little Rock Terminal |  |  |
Business Acquisition [Line Items] |  |  |
Net sales |  | 908,867 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_NorthLittleRockTerminalMember | 1,024,025 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_NorthLittleRockTerminalMember
Net income |  | 34,958 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_NorthLittleRockTerminalMember | 15,157 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_NorthLittleRockTerminalMember
Hopewell |  |  |
Business Acquisition [Line Items] |  |  |
Net sales |  | 908,382 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_HopewellMember | 1,023,540 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_HopewellMember
Net income |  | 33,981 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_HopewellMember | 14,180 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_HopewellMember
Nettleton and Big Sandy [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Net sales |  |  | 1,022,715 us-gaap_BusinessAcquisitionsProFormaRevenue / us-gaap_BusinessAcquisitionAxis = dkl_NettletonandBigSandyMember
Net income |  |  | $ 13,989 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss / us-gaap_BusinessAcquisitionAxis = dkl_NettletonandBigSandyMember

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