Long-Term Debt Long-term debt - Early redemption premium percentages (Details) - Rose Rock Midstream L P [Member] - Senior Notes [Member] - Rose Rock Notes due 2023 [Member]	6 Months Ended
	Jun. 30, 2015
Debt Instrument, Redemption, Period One [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	102.813%
Debt Instrument, Redemption, Period Two [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	101.406%
Debt Instrument, Redemption, Period Three [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	100.00%