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Income Taxes Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Liabilities, Gross, Noncurrent	$ 200,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent	$ 300,000us-gaap_DeferredTaxLiabilitiesGrossNoncurrent
Tax benefit from conversion to Partnership	0dkl_TaxbenefitfromconversiontoPartnership	0dkl_TaxbenefitfromconversiontoPartnership	18,534,000dkl_TaxbenefitfromconversiontoPartnership
Uncertain tax positions	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits
Uncertain tax positions, Income Tax Penalties and Interest Expense	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accounts payable [Member]
Income taxes payable	$ 600,000us-gaap_AccruedIncomeTaxesCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableMember	$ 400,000us-gaap_AccruedIncomeTaxesCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_AccountsPayableMember

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- Definition

Tax benefit from conversion to Partnership

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- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5



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Gross amount of noncurrent deferred tax liabilities, which result from applying the applicable tax rate to taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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