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Subsequent Events - Royalty Trust Distributions (Details) (Royalty Trust Distributions, USD $)
In Thousands, unless otherwise specified
Jan. 30, 2014
Royalty Trusts
  
Subsequent Event [Line Items]  
Total distribution $ 68,345
Amount to be distributed to third-party unitholders 53,118
Mississippian Trust I
  
Subsequent Event [Line Items]  
Total distribution 10,508
Amount to be distributed to third-party unitholders 10,242
Permian Trust
  
Subsequent Event [Line Items]  
Total distribution 33,677
Amount to be distributed to third-party unitholders 25,239
Mississippian Trust II
  
Subsequent Event [Line Items]  
Total distribution 24,160
Amount to be distributed to third-party unitholders $ 17,637