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Rose Rock Midstream, L.P. (Details) (Rose Rock Midstream, L.P. [Member])
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Ownership Interest in Rose Rock    
Ownership interest in subsidiary, shares 59.00% 59.00%
Common Units [Member] | General Partner Interest [Member]
   
Ownership Interest in Rose Rock    
Noncontrolling interests, ownership percentage 2.00% 2.00%
Subordinated Units [Member] | Limited Partner Interests [Member]
   
Ownership Interest in Rose Rock    
Controlling interests, ownership percentage 57.00% [1] 57.00%
[1] (a)Represents 1.4 million common units and 8.4 million subordinated units