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Related Party Transactions Operation and Management Services Agreement (Details) - General Partner - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operation and Management Services Agreement [Member]
Related Party Transaction [Line Items]
Management Fee, Amount Paid			$ 5.9
Partnership Agreement [Member]
Related Party Transaction [Line Items]
Management Fee, Amount Paid	$ 22.8	$ 12.3	$ 6.5

X

- Definition

Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_GeneralPartnerMember
Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dk_OperationandManagementServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=dk_PartnershipAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: