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Equity - Allocations of Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Net income attributable to partners	$ 23,326	$ 16,923	$ 68,903	$ 50,495
Less: General partner's IDRs	(6,295)	(4,496)	(17,449)	(12,649)
Net income available to partners	$ 17,031	$ 12,427	$ 51,454	$ 37,846
General partner's ownership interest (as percent)	2.00%	2.00%	2.00%	2.00%
General partner's allocated interest in net income	$ 341	$ 249	$ 1,029	$ 757
General partner's IDRs	6,295	4,496	17,449	12,649
Total general partner's interest in net income	$ 6,636	$ 4,745	$ 18,478	$ 13,406

X

- Definition

Amount of net income allocated to the general partners, excluding incentive distribution rights.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate amount of net income attributable to the partners, which excludes the amount of net income attributable to predecessor entities.

+ References

No definition available.

+ Details

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X

- Definition

Net income after adjustments for Incentive Distribution Rights of the general partner.

+ References

No definition available.

+ Details

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Namespace Prefix:	dkl_
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- References

No definition available.

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X

- Definition

Amount of incentive obligation paid in cash or stock during the period to a limited liability corporation managing member or limited partnership general partner.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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X

- Definition

Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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X

- Definition

Aggregate amount of net income allocated to general partners.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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