Organization and Basis of Presentation, Significant Accounting Policies Continued (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 claims	Dec. 31, 2011 claims
Policy Information
Impairment of long-lived assets	$ 0	$ 0
Amortization of deferred issuance costs	1,100,000	400,000
Number of outstanding lawsuits, administrative proceedings and governmental investigations (claims)	0	0
Deferred revenue related to shortfall billings	$ 300,000	$ 0
Length of time to apply shortfall payments (months)	3 months
Crude oil
Policy Information
Percent retained for volume losses	0.20%
Refined products
Policy Information
Percent retained for volume losses	0.25%
Minimum
Policy Information
Property, plant and equipment, estimated useful life (years)	1 year
Maximum
Policy Information
Property, plant and equipment, estimated useful life (years)	30 years