Properties and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 691,170,000	$ 563,716,000
Accumulated Depreciation	154,745,000	128,766,000
Properties and equipment, net	536,425,000	434,950,000
Interest Costs, Capitalized During Period	891,000	455,000	1,008,000
Depreciation	26,200,000	23,700,000	19,700,000
Pipelines, terminals and tankage [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	633,095,000	507,260,000
Land and right of way [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	27,149,000	25,264,000
Other [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	16,507,000	14,591,000
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 14,419,000	$ 16,601,000