Disposals And Impairments of Long-Lived Assets (Details Textual) (USD $)	12 Months Ended				12 Months Ended							12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2009	Dec. 31, 2010 White Cliffs Pipeline, LLC [Member]	Dec. 31, 2011 SemStream Arizona Residential Propane Business [Member]	Dec. 31, 2011 SemStream [Member]	Dec. 31, 2012 SemLogistics [Member] Customer	Dec. 31, 2011 SemLogistics [Member]		Sep. 30, 2011 SemLogistics [Member]	Dec. 31, 2010 SemMexico [Member]		Dec. 31, 2012 SemMexico [Member]	Dec. 31, 2011 SemMexico [Member]
Gain (loss) on goodwill impairment	$ 47,804,000	$ 61,173,000				$ 3,600,000			$ 44,663,000	[1]		$ 8,863,000	[2]
Working capital adjustment							2,100,000
Cash and interests received from net assets contribution							93,000,000
Estimated fair value							184,000,000
Gain on transfer of assets for ownership							44,300,000
Write-off of software							1,600,000
Write-off capitalized loan fees							2,200,000
Present value of estimated future cash flows, discounted rate						9.40%						13.84%
Impairment of intangible assets						5,000,000
Number of customers								2
Goodwill	9,453,000	107,823,000	9,884,000	186,844,000	17,000,000						44,700,000			9,884,000	9,453,000
Proceeds from sale					$ 140,800,000

[1] High crude oil prices and backwardated market conditions in 2011 had a negative effect on SemLogistic’s storage economics. As a result, the demand for storage is depressed and SemLogistics has had difficulty securing contract renewals. SemLogistics successfully passed the initial 2011 goodwill impairment test. However, a review of the sensitivity of the test results indicated that a ten percent reduction in the estimated revenue in 2012 and 2013 would result in a test failure. In addition, we received notice in late January 2012 from two customers that their intentions were not to renew their storage contracts upon expiration. These notifications, coupled with the sensitivity of the test results to loss of revenue, led us to conclude that impairment of the goodwill of SemLogistics was required. Accordingly, we impaired the full amount of goodwill which was $44.7 million at October 1, 2011.

[2] We test goodwill for impairment as of October 1 of each year. Upon completing this impairment test for 2010, we concluded that the goodwill attributable to our SemMexico segment was impaired, due primarily to a decline in demand for asphalt resulting from a slowdown in road construction. To calculate the impairment loss, we estimated the fair value of the SemMexico segment using the present value of estimated future cash flows, discounted at a rate of 13.84%.