Commitments and Contingencies (Details Textual) bbl in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) bbl Number_Of_Sites	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked | Number_Of_Sites	6
Number of sites appearing to have soil contamination | Number_Of_Sites	4
Number of sites requiring remediation and water contamination as per phase two investigations | Number_Of_Sites	4
Number of sites closed | Number_Of_Sites	1
Estimated cost to retire facilities	$ 117,800,000
Asset Retirement Obligation, Revision of Estimate	(26,000,000)
Asset retirement obligation additional estimated costs attributable to third-party owners'	20,000,000
Operating leases, rent expense	$ 15,500,000	$ 16,200,000	$ 11,400,000
Sites being monitored for ground water contamination	2
Sites completing assessment	2
Crude Transportation [Member]
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked | Number_Of_Sites	5
SemGas [Member]
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked | Number_Of_Sites	1
Minimum [Member]
Commitments and Contingencies (Textual) [Abstract]
Notice required to cancel purchase agreements, days	30 days
Maximum [Member]
Commitments and Contingencies (Textual) [Abstract]
Notice required to cancel purchase agreements, days	120 days
SemCAMS [Member]
Commitments and Contingencies (Textual) [Abstract]
Asset Retirement Obligation, Revision of Estimate	$ (26,000,000)
Pipeline transportation capacity [Member] | Rose Rock Midstream L P [Member]
Commitments and Contingencies (Textual) [Abstract]
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required | bbl	5
Term of unconditional purchase obligation	7 years
Unrecorded unconditional purchase obligation, annual amount	$ 11,900,000
Pipeline transportation capacity [Member] | White Cliffs Pipeline, LLC [Member] | Rose Rock Midstream L P [Member]
Commitments and Contingencies (Textual) [Abstract]
Unrecorded Unconditional Purchase Obligation, Minimum Quantity Required | bbl	5
Term of unconditional purchase obligation	5 years
Unrecorded unconditional purchase obligation, annual amount	$ 9,400,000
Pipeline transportation capacity [Member] | SemGas [Member]
Commitments and Contingencies (Textual) [Abstract]
Unrecorded Unconditional Purchase Obligation	110,700
Capital Addition Purchase Commitments [Member] | Maurepas Pipeline, LLC [Member]
Commitments and Contingencies (Textual) [Abstract]
Purchase Obligation, Due in Next Twelve Months	$ 325,000,000