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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2014
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, 2011 to December 31, 2014 is summarized below:
 
Unvested
Shares
 
Average
Grant Date
Fair Value
 
Aggregate Fair Value of Shares (in thousands)
Outstanding at December 31, 2011
410,506

 
$
26.59

 
 
Awards granted - 2012
246,432

 
$
27.81

 


Awards vested - 2012
(162,986
)
 
$
25.20

 
$
4,107

Awards forfeited - 2012
(43,400
)
 
$
27.74

 
 
Outstanding at December 31, 2012
450,552

 
$
26.87

 
 
Awards granted - 2013
201,451

 
$
52.78

 


Awards vested - 2013
(107,988
)
 
$
25.71

 
$
2,776

Awards forfeited - 2013
(13,412
)
 
$
32.36

 
 
Outstanding at December 31, 2013
530,603

 
$
36.80

 
 
Awards granted - 2014
207,786

 
$
77.14

 


Awards vested - 2014
(169,340
)
 
$
33.07

 
$
5,600

Awards forfeited - 2014
(119,130
)
 
$
42.16

 
 
Outstanding at December 31, 2014
449,919

 
$
70.69

 
 
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 2014, 2013 and 2012:
 
2014
 
2013
Volatility
29.3%
 
28.9%
Risk-free interest rate
0.66%
 
0.35%
Rose Rock equity incentive plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of unvested share activity
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, 2011
—

 
$
—

 
 
Awards granted - 2012
46,069

 
$
21.97

 
 
Awards vested - 2012
—

 
$
—

 
$
—

Awards forfeited - 2012
(2,109
)
 
$
20.60

 
 
Outstanding at December 31, 2012
43,960

 
$
21.91

 
 
Awards granted - 2013
49,104

 
$
34.41

 
 
Awards vested - 2013
(9,333
)
 
$
27.25

 
$
254

Awards forfeited - 2013
(783
)
 
$
34.40

 
 
Outstanding at December 31, 2013
82,948

 
$
28.59

 
 
Awards granted - 2014
46,536

 
$
41.35

 
 
Awards vested - 2014
(5,712
)
 
$
35.87

 
$
205

Awards forfeited - 2014
(21,432
)
 
$
29.82

 
 
Outstanding at December 31, 2014
102,340

 
$
33.79