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Income Taxes Reconciliation of Actual Income Tax Expense to Statutory (Details) (USD $) In Thousands, unless otherwise specified	2 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Income Tax Disclosure [Abstract]
Provision for federal income taxes at statutory rate		$ 0us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 0us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate		$ 4,047us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal tax provision		492us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	794us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes		(58)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Valuation allowance		0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance		193us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Permanent differences		0dkl_IncomeTaxReconciliationPermanentDifferences	0dkl_IncomeTaxReconciliationPermanentDifferences		300dkl_IncomeTaxReconciliationPermanentDifferences
Conversion to partnership		0dkl_TaxbenefitfromconversiontoPartnership	0dkl_TaxbenefitfromconversiontoPartnership		(18,534)dkl_TaxbenefitfromconversiontoPartnership
Other items		(360)us-gaap_IncomeTaxReconciliationOtherAdjustments	(37)us-gaap_IncomeTaxReconciliationOtherAdjustments		28us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense (benefit)	$ 100us-gaap_IncomeTaxExpenseBenefit	$ 132us-gaap_IncomeTaxExpenseBenefit	$ 757us-gaap_IncomeTaxExpenseBenefit	[1]	$ (14,024)us-gaap_IncomeTaxExpenseBenefit	[1]
[1] Adjusted to include the historical results of the El Dorado Terminal and Tank Assets. See Notes 1 and 3 for further discussion.

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Income Tax Reconciliation, Permanent Differences

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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