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Commitments and Contingencies Letters of Credit (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Letters of Credit [Abstract]
Letters of Credit Available, Amount	$ 50.0
Letters of Credit Outstanding, Amount	$ 10.0

X

- Details

Name:	dkl_LettersOfCreditAbstract
Namespace Prefix:	dkl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Letters of Credit Available, Amount

+ References

No definition available.

+ Details

Name:	dkl_LettersOfCreditAvailableAmount
Namespace Prefix:	dkl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant