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.

No definition available.

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Related Party Transactions (Leasing Agreements) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Related Party Transaction [Line Items]
Operating Leases, Rent Expense	$ 8.8us-gaap_LeaseAndRentalExpense	$ 6.4us-gaap_LeaseAndRentalExpense	$ 6.2us-gaap_LeaseAndRentalExpense
Maximum [Member] \| Western Refining, Inc. [Member] \| Ground Lease and Access Agreements [Member]
Related Party Transaction [Line Items]
Operating Leases, Rent Expense				$ 0.1