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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2012
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
Shares
 
Average
Grant Date
Fair Value(*)
Outstanding at December 31, 2009
148,533

 
$
25.00

Awards granted - 2010
562,295

 
$
25.00

Awards vested - 2010
(92,833
)
 
$
25.00

Awards forfeited - 2010
(115,093
)
 
$
25.00

Outstanding at December 31, 2010
502,902

 
$
25.00

Awards granted - 2011 (**)
173,982

 
$
28.90

Awards vested - 2011
(201,361
)
 
$
25.00

Awards forfeited - 2011
(65,017
)
 
$
25.36

Outstanding at December 31, 2011
410,506

 
$
26.59

Awards granted - 2012 (**)
246,432

 
$
27.81

Awards vested - 2012
(162,986
)
 
$
25.20

Award forfeited - 2012
(43,400
)
 
$
27.74

Outstanding at December 31, 2012
450,552

 
$
26.87

(*)
The grant date fair value of awards issued prior to our listing on the New York Stock Exchange was estimated at $25 per share, which was the per share reorganization value of the Company. Subsequent to our listing, the grant date fair value is determined based on the closing price on the New York Stock Exchange on the date of issue.
(**)
For certain of the awards granted in 2012 and 2011, the number of shares that will vest is contingent upon our achievement of certain specified targets. These performance awards are valued based on the grant date closing price on the New York Stock Exchange assuming that 100% of the awards will vest. If we meet the specified maximum targets, approximately 42 thousand and 30 thousand additional shares could vest related to the 2012 and 2011 awards, respectively.
Summary of scheduled vesting of awards Granted
The following table, which includes potential shares from specified targets assumed to be achieved (as discussed above), summarizes the scheduled vesting of awards that have been granted as of December 31, 2012:
Year ended December 31, 2013
107,790

shares
Year ended December 31, 2014
155,382

shares
Year ended December 31, 2015
255,740

shares
Summary of expense recoreded and expect to record related to awards
The following table summarizes the expense we have recorded and expect to record related to awards that have been granted through December 31, 2012 (in thousands):
Year ended December 31, 2010
$
6,230

Year ended December 31, 2011
$
5,424

Year ended December 31, 2012
$
6,246

Year ended December 31, 2013 (estimated)
$
3,576

Year ended December 31, 2014 (estimated)
$
2,022

Year ended December 31, 2015 (estimated)
$
213
Rose Rock Midstream L P [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
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
Summary of expense recoreded and expect to record related to awards
The following table summarizes the expense we have recorded and expect to record related to awards that have been granted through December 31, 2012 (in thousands):
Year ended December 31, 2012
$
308

Year ended December 31, 2013 (estimated)
$
404

Year ended December 31, 2014 (estimated)
$
235

Year ended December 31, 2015 (estimated)
$
12
Schedule of vesting awards
The following table summarizes the scheduled vesting of awards that have been granted as of December 31, 2012:
Year ended December 31, 2013
9,333

shares
Year ended December 31, 2014
—

shares
Year ended December 31, 2015
34,627

shares