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Commitments and Contingencies Letters of Credit (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Letters of Credit [Abstract]
Letters of Credit	$ 12.0

X

- Details

Name:	dk_LettersOfCreditAbstract
Namespace Prefix:	dk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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