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Subsequent Events - Royalty Trust Distributions (Details) (Royalty Trust Distributions, USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Royalty Trusts
  
Subsequent Event [Line Items]  
Total distribution $ 76,361
Amount to be distributed to third-party unitholders 51,256
SandRidge Mississippian Trust I
  
Subsequent Event [Line Items]  
Total distribution 18,221
Amount to be distributed to third-party unitholders 13,322
SandRidge Permian Trust
  
Subsequent Event [Line Items]  
Total distribution 31,659
Amount to be distributed to third-party unitholders 22,011
SandRidge Mississippian Trust II
  
Subsequent Event [Line Items]  
Total distribution 26,481
Amount to be distributed to third-party unitholders $ 15,923