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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of unvested share activity
The activity related to these awards during the period from December 31, 2014 to December 31, 2017 is summarized below:
 
Unvested
Shares
 
Average
Grant Date
Fair Value
 
Aggregate Fair Value of Shares (in thousands)
Outstanding at December 31, 2014
449,919

 
$
70.69

 
 
Awards granted - 2015
151,789

 
$
77.93

 


Awards vested - 2015
(181,906
)
 
$
35.18

 
$
6,399

Awards forfeited - 2015
(8,494
)
 
$
42.05

 
 
Outstanding at December 31, 2015
411,308

 
$
75.25

 
 
Awards granted - 2016
702,309

 
$
19.18

 


Awards vested - 2016
(168,096
)
 
$
20.38

 
$
3,426

Awards forfeited - 2016
(34,255
)
 
$
42.42

 
 
Outstanding at December 31, 2016
911,266

 
$
31.09

 
 
Awards granted - 2017
377,766

 
$
35.22

 
 
Awards vested - 2017
(149,961
)
 
$
33.60

 
$
5,039

Awards forfeited - 2017
(54,981
)
 
$
81.80

 
 
Outstanding at December 31, 2017
1,084,090

 
$
29.07

 
 
Schedule of Share-based Payment Award Valuation Assumptions [Table Text Block]
The following table sets forth the assumptions used in the valuations of these awards granted in 2017, 2016 and 2015:
 
2017
 
2016
 
2015
Volatility
54.2%
 
51.9%
 
26.8%
Risk-free interest rate
1.57%
 
0.98%
 
1.06%
Rose Rock Midstream L P [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
The activity related to these awards is summarized below:
 
Unvested Units
 
Average Grant Date Fair Value
 
Aggregate Fair Value of Units (in thousands)
Outstanding at December 31, 2014
102,340

 
$
33.79

 
 
Awards granted - 2015
36,527

 
$
39.03

 
 
Awards vested - 2015
(38,366
)
 
$
27.54

 
$
1,057

Awards forfeited - 2015
(310
)
 
$
42.80

 
 
Outstanding at December 31, 2015
100,191

 
$
38.70

 
 
Awards granted - 2016
117,204

 
$
9.62

 
 
Awards vested - 2016
(57,458
)
 
$
11.58

 
$
665

Awards forfeited - 2016
(1,846
)
 
$
26.55

 
 
Awards converted to SemGroup awards
(158,091
)
 
$
19.57

 
 
Outstanding at December 31, 2016
—

 
$
—