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Commitments and Contingencies Operating Leases (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Leases [Abstract]
Operating Leases, Rent Expense	$ 0.2us-gaap_LeaseAndRentalExpense	$ 0.2us-gaap_LeaseAndRentalExpense

X

- Details

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

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration