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Equity Cash distributions (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended					3 Months Ended		0 Months Ended
	Feb. 13, 2015	Nov. 14, 2014	Aug. 14, 2014	May 14, 2014	Feb. 13, 2014	Mar. 31, 2015	Mar. 31, 2014	Apr. 21, 2015
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution Per Limited Partner Unit, Paid	$ 0.510us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit	$ 0.490us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit	$ 0.475us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit	$ 0.425us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit	$ 0.415us-gaap_DistributionMadeToLimitedPartnerDistributionsPaidPerUnit
Total Quarterly Distribution per Limited Partner Unit, Annualized	$ 2.04dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit	$ 1.96dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit	$ 1.90dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit	$ 1.70dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit	$ 1.66dkl_DistributionMadeToMemberOrLimitedPartnerDistributionsPaidAnnualizedPerUnit
Total Cash Distribution, including general partner IDRs	$ 13,056us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid	$ 12,394us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid	$ 11,910us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid	$ 10,474us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid	$ 10,228us-gaap_DistributionMadeToLimitedPartnerCashDistributionsPaid
Total Quarterly Distribution per Limited Partner Unit						$ 0.530us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit	$ 0.425us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit
Total Cash Distribution, including general partner IDRs (in thousands)						13,702dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared	10,474dkl_DistributionMadeToPartnersTotalCashDistributionsDeclared
Subsequent Event [Member]
Distribution Made to Limited Partner [Line Items]
Total Quarterly Distribution per Limited Partner Unit								$ 0.530us-gaap_DistributionMadeToLimitedPartnerDistributionsDeclaredPerUnit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Total Quarterly Distribution Per Limited Partner Unit, Annualized								$ 2.12dkl_DistributionMadeToLimitedPartnerDistributionsDeclaredAnnualizedPerUnit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Distribution Made to Limited Partner, Cash Distributions Declared								$ 13,702us-gaap_DistributionMadeToLimitedPartnerCashDistributionsDeclared / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Per unit of ownership amount of cash distributions declared to be paid to unit-holder of a limited partnership (LP).

+ References

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Annualized per-share or per-unit cash distributions paid to a common shareholder or unit-holder by an LLC or LP.

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The amount of cash distributions declared to partners by a limited partnership.

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- Definition

Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

+ References

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

-Publisher FASB

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