Acquisitions 2014 Acquisition, West Coast Logistic Assets (Details) (USD $)	6 Months Ended						0 Months Ended		0 Months Ended						0 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 West Coast Logistics Assets	Jun. 30, 2014 West Coast Logistics Assets Storage Facility facility	Jun. 30, 2014 West Coast Logistics Assets Refined Products Pipeline facility	Jun. 30, 2014 West Coast Logistics Assets Marketing Terminals facility	Jul. 01, 2014 Subsequent Event Phase One West Coast Logistics Assets	Jul. 01, 2014 Subsequent Event Phase One West Coast Logistics Assets	Jul. 01, 2014 Subsequent Event Phase Two West Coast Logistics Assets	Jul. 01, 2014 Subsequent Event Limited Partner, common units Phase One West Coast Logistics Assets	Jul. 01, 2014 Subsequent Event General Partner, units Phase One West Coast Logistics Assets	Jul. 01, 2014 Nikiski Alaska Subsequent Event Phase One West Coast Logistics Assets Truck Terminals facility	Jul. 01, 2014 Nikiski Alaska Subsequent Event Phase One West Coast Logistics Assets Storage Tanks facility	Jul. 01, 2014 Anacortes Washington Subsequent Event Phase One West Coast Logistics Assets Truck Terminals facility	Jul. 01, 2014 Anacortes Washington Subsequent Event Phase One West Coast Logistics Assets Storage Tanks bbl facility	Jul. 01, 2014 Anacortes Washington Subsequent Event Phase One West Coast Logistics Assets Storage Tanks facility	Jul. 01, 2014 Anacortes Washington Subsequent Event Phase One West Coast Logistics Assets Rail loading and unloading Facilities facility	Jul. 01, 2014 Martinez California Subsequent Event Phase One West Coast Logistics Assets Truck Terminals facility	Jul. 01, 2014 Martinez California Subsequent Event Phase One West Coast Logistics Assets Rail loading and unloading Facilities facility
Acquisition
Business Acquisition, Date of Acquisition Agreement			Jun. 23, 2014
Purchase price			$ 270,000,000				$ 241,400,000
Acquisition date							Jul. 01, 2014
Cash consideration							214,400,000		28,600,000
Equity consideration, value								27,000,000
Borrowings under revolving credit agreement	$ 255,100,000	$ 544,000,000					$ 214,000,000
Equity consideration, number of units (Units)										370,843	8,856
Number of assets (assets)				1	1	3						1	6	1		4	1	1	1
Storage Capacity															1,500,000