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Other Intangibles (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Other Intangible Assets [Line Items]
Accumulated Amortization	$ (8,949,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization	$ (7,885,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, gross	20,298,000us-gaap_IntangibleAssetsGrossExcludingGoodwill	20,259,000us-gaap_IntangibleAssetsGrossExcludingGoodwill
Intangible assets, net	11,349,000us-gaap_IntangibleAssetsNetExcludingGoodwill	12,374,000us-gaap_IntangibleAssetsNetExcludingGoodwill	[1]
Rights-of-Way [Member]
Other Intangible Assets [Line Items]
Rights-of-way assets	8,071,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = dkl_RightsofWayMember	8,032,000us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = dkl_RightsofWayMember
Supply contracts [Member]
Other Intangible Assets [Line Items]
Estimated useful life (years)	11 years 6 months
Intangible Assets, Gross	12,227,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember	12,227,000us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
Accumulated Amortization	(8,949,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember	(7,885,000)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
Intangible assets, net	3,278,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember	4,342,000us-gaap_FiniteLivedIntangibleAssetsNet / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
Amortization expense	1,100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember	1,100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember		1,100,000us-gaap_AmortizationOfIntangibleAssets / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
Amortization Expense, 2015		1,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
Amortization Expense, 2016		1,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
Amortization Expense, 2017		$ 1,100,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = dkl_SupplyContractsMember
[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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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense expected to be recognized during the next fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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