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Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 293,525 us-gaap_PropertyPlantAndEquipmentGross | $ 264,072 us-gaap_PropertyPlantAndEquipmentGross | [1]
Less: accumulated depreciation | (52,992)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | (39,566)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment | [1]
Property, plant and equipment, net | 240,533 us-gaap_PropertyPlantAndEquipmentNet | 224,506 us-gaap_PropertyPlantAndEquipmentNet | [1]
Depreciation expense | 13,642 us-gaap_DepreciationNonproduction | 12,675 us-gaap_DepreciationNonproduction |
Pipelines and Transportation |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 227,927 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | 200,001 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |
Less: accumulated depreciation | (36,459)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | (25,128)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |
Property, plant and equipment, net | 191,468 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | 174,873 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |
Depreciation expense | 10,395 us-gaap_DepreciationNonproduction / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember | 9,928 us-gaap_DepreciationNonproduction / us-gaap_StatementBusinessSegmentsAxis = dkl_PipelinesAndTransportationMember |
Wholesale Marketing and Terminalling |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 65,598 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | 64,071 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |
Less: accumulated depreciation | (16,533)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | (14,438)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |
Property, plant and equipment, net | 49,065 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | 49,633 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |
Depreciation expense | 3,247 us-gaap_DepreciationNonproduction / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember | 2,747 us-gaap_DepreciationNonproduction / us-gaap_StatementBusinessSegmentsAxis = dkl_WholesaleMarketingAndTerminallingMember |
Land and land improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 2,000 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember | 1,931 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_LandAndLandImprovementsMember |
Building and building improvements |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 1,169 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember | 1,057 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_BuildingAndBuildingImprovementsMember |
Pipelines and terminals |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 266,196 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dkl_PipelinesAndTerminalsMember | 229,672 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = dkl_PipelinesAndTerminalsMember |
Asset retirement obligations |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 2,073 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetRetirementObligationCostsMember | 1,999 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetRetirementObligationCostsMember |
Other equipment |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | 3,764 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember | 2,959 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_OtherMachineryAndEquipmentMember |
Construction in process |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, plant and equipment | $ 18,323 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember | $ 26,454 us-gaap_PropertyPlantAndEquipmentGross / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_ConstructionInProgressMember |
[1] | Includes the historical balances of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 14 -Article 5 + Details
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