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Segment Data (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 114,583 us-gaap_RevenueFromRelatedParties | [1],[2] | $ 78,173 us-gaap_RevenueFromRelatedParties | [1],[2],[3] | $ 43,614 us-gaap_RevenueFromRelatedParties | [3],[4],[5]
Third Party |  |  |  |  |  |  |  |  |  |  |  |  |  | 726,670 us-gaap_SalesRevenueServicesNet | [1],[2] | 829,255 us-gaap_SalesRevenueServicesNet | [1],[2],[3] | 978,972 us-gaap_SalesRevenueServicesNet | [3],[4],[5]
Total Pipelines and Transportation | 173,347 us-gaap_SalesRevenueNet | 228,036 us-gaap_SalesRevenueNet | 236,343 us-gaap_SalesRevenueNet | 203,527 us-gaap_SalesRevenueNet | [6] | 223,097 us-gaap_SalesRevenueNet | [7] | 243,295 us-gaap_SalesRevenueNet | [6],[7] | 230,141 us-gaap_SalesRevenueNet | [6],[7] | 210,894 us-gaap_SalesRevenueNet | [6],[7] | 841,253 us-gaap_SalesRevenueNet | [4],[5] | 907,428 us-gaap_SalesRevenueNet | [1],[2],[3] | 1,022,586 us-gaap_SalesRevenueNet | [1],[2],[3]
Operating Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 697,221 us-gaap_CostOfGoodsSold | [4],[5] | 811,364 us-gaap_CostOfGoodsSold | [1],[2],[3] | 959,434 us-gaap_CostOfGoodsSold | [1],[2],[3]
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,786 us-gaap_OperatingCostsAndExpenses | [4],[5] | 35,640 us-gaap_OperatingCostsAndExpenses | [1],[2],[3] | 39,420 us-gaap_OperatingCostsAndExpenses | [1],[2],[3]
Segment Contribution Margin |  |  |  |  |  |  |  |  |  |  |  |  |  | 105,246 dkl_SegmentContributionMargin | [4],[5] | 60,424 dkl_SegmentContributionMargin | [1],[2] | 23,732 dkl_SegmentContributionMargin | [1],[2]
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,616 us-gaap_SellingGeneralAndAdministrativeExpense | [4],[5] | 7,526 us-gaap_SellingGeneralAndAdministrativeExpense | [1],[2],[3] | 9,856 us-gaap_SellingGeneralAndAdministrativeExpense | [1],[2],[3]
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,705 us-gaap_DepreciationAndAmortization | [4],[5] | 13,738 us-gaap_DepreciationAndAmortization | [1],[2],[3],[8] | 11,343 us-gaap_DepreciationAndAmortization | [1],[2],[3],[8]
Loss on asset disposals |  |  |  |  |  |  |  |  |  |  |  |  |  | 83 us-gaap_GainLossOnDispositionOfAssets | [4],[5] | 166 us-gaap_GainLossOnDispositionOfAssets | [1],[2],[3],[8] | 9 us-gaap_GainLossOnDispositionOfAssets | [1],[2],[3],[8]
Operating income | 22,118 us-gaap_OperatingIncomeLoss | 17,488 us-gaap_OperatingIncomeLoss | 24,377 us-gaap_OperatingIncomeLoss | 15,859 us-gaap_OperatingIncomeLoss | [6] | 12,355 us-gaap_OperatingIncomeLoss | [7] | 10,986 us-gaap_OperatingIncomeLoss | [6],[7] | 7,443 us-gaap_OperatingIncomeLoss | [6],[7] | 8,210 us-gaap_OperatingIncomeLoss | [6],[7] | 79,842 us-gaap_OperatingIncomeLoss | [3],[4],[5] | 38,994 us-gaap_OperatingIncomeLoss | [1],[2],[3] | 2,524 us-gaap_OperatingIncomeLoss | [1],[2],[3]
Total assets | 311,839 us-gaap_Assets |  |  |  |  | 301,344 us-gaap_Assets | [9] |  |  |  |  |  |  | 311,839 us-gaap_Assets |  | 301,344 us-gaap_Assets | [9] |  |
Capital spending (excluding business combinations) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,132 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [4],[5] | 12,662 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [1],[2],[8] | 30,816 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | [1],[2],[8]
Pipelines and Transportation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,683 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 51,878 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 30,145 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5]
Third Party |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,665 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 8,359 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 3,394 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5]
Total Pipelines and Transportation |  |  |  |  |  |  |  |  |  |  |  |  |  | 91,348 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5] | 60,237 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 33,539 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2]
Operating Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,294 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5] | 764 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 0 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2]
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 31,300 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5] | 27,465 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 32,359 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2]
Segment Contribution Margin |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,754 dkl_SegmentContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5] | 32,008 dkl_SegmentContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 1,180 dkl_SegmentContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2]
Total assets | 210,846 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  |  |  |  | 195,984 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  |  |  |  |  |  |  | 210,846 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  | 195,984 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |  |  |
Capital spending (excluding business combinations) |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,768 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [4],[5] | 9,621 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2] | 23,845 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | [1],[2]
Wholesale Marketing and Terminalling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,900 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 26,295 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 13,469 us-gaap_RevenueFromRelatedParties / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5]
Third Party |  |  |  |  |  |  |  |  |  |  |  |  |  | 716,005 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 820,896 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 975,578 us-gaap_SalesRevenueServicesNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5]
Total Pipelines and Transportation |  |  |  |  |  |  |  |  |  |  |  |  |  | 749,905 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5] | 847,191 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 989,047 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2]
Operating Costs and Expenses [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 692,927 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5] | 810,600 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 959,434 us-gaap_CostOfGoodsSold / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2]
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,486 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5] | 8,175 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 7,061 us-gaap_OperatingCostsAndExpenses / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2]
Segment Contribution Margin |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,492 dkl_SegmentContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5] | 28,416 dkl_SegmentContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | 22,552 dkl_SegmentContributionMargin / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2]
Total assets | 100,993 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  |  |  |  | 105,360 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  |  |  |  |  |  |  | 100,993 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  | 105,360 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |  |  |
Capital spending (excluding business combinations) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,364 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [4],[5] | $ 3,041 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2] | $ 6,971 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | [1],[2]
[1] | Capital spending includes expenditures incurred in connection with the assets acquired in the El Dorado Acquisition
[2] | The information presented includes the results of operations of the El Dorado Terminal and Tank Assets. Prior to the El Dorado Acquisition, the El Dorado Predecessor did not record all revenues for intercompany gathering, pipeline transportation, terminalling and storage services.
[3] | Adjusted to include the historical results of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.
[4] | The information presented includes the results of operations of the El Dorado Terminal and Tank Assets and the Tyler Terminal and Tank Assets. Prior to the El Dorado Acquisition and the Tyler Acquisition, the El Dorado Predecessor and the Tyler Predecessor did not record all revenues for intercompany gathering, pipeline transportation, terminalling and storage services.
[5] | Capital spending includes expenditures incurred in connection with the assets acquired in the El Dorado Acquisition and the Tyler Acquisition.
[6] | The information presented includes the results of operations of the El Dorado Predecessor and the Tyler Predecessor
[7] | The information presented includes the results of operations of the El Dorado Predecessor.
[8] | Adjusted to include the historical cash flows of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.
[9] | Includes the historical balances of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.

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