Commitments and Contingencies (Details Textual) bbl in Thousands		3 Months Ended
	Oct. 01, 2015 bbl	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commitments and Contingencies (Textual) [Abstract]
Sites in various stages of follow-up		4
Sites with limited soil and ground water impact		2
Sites requiring additional investigation		2
Site contingency number of sites checked		6
Accrued Liabilities		$ 85,688,000	$ 85,047,000
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
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	5 years
Unrecorded unconditional purchase obligation, annual amount		$ 9,400,000
Crude Transportation [Member]
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked		5
SemCAMS [Member]
Commitments and Contingencies (Textual) [Abstract]
Asset retirement obligation liability		$ 17,600,000
Estimated cost to retire facilities		$ 125,900,000
SemGas [Member]
Commitments and Contingencies (Textual) [Abstract]
Site contingency number of sites checked		1
SemGas [Member] | Commitments [Member]
Commitments and Contingencies (Textual) [Abstract]
Accrued Liabilities		$ 394,000
Proposed Department of Transportation penalty [Member] | Rose Rock Midstream L P [Member]
Commitments and Contingencies (Textual) [Abstract]
Accrued Liabilities		$ 600,200