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Commitments and Contingencies Operating Leases (Details) (USD $)	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 26, 2013 Tyler Lease and Access Agreement [Member]	Jul. 31, 2013 Tyler Lease and Access Agreement [Member]
Related Party Transaction [Line Items]
Related party transaction, annual lease payment				$ 100	$ 100
Lessee Leasing Arrangements, Operating Leases, Term of Contract				50 years
Operating Leases, Rent Expense	$ 500,000	$ 500,000	$ 300,000

X

- Definition

The yearly payments due under the lease entered into in with related party.

+ References

No definition available.

+ Details

Name:	dk_Relatedpartytransactionannualleasepayment
Namespace Prefix:	dk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

X

- Definition

Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_LesseeLeasingArrangementsOperatingLeasesTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration