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Commitments and Contingencies Operating Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Leases [Abstract]
Lease expense	$ 1.3	$ 1.6

X

- Definition

Operating Leases [Abstract]

+ References

No definition available.

+ 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