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Subsequent Events - Royalty Trust Distributions (Details) (Royalty Trust Distributions, USD $)
In Thousands, unless otherwise specified
Jul. 31, 2014
Royalty Trusts
  
Subsequent Event  
Total distribution $ 56,192
Amount to be distributed to third-party unitholders 47,298
Mississippian Trust I
  
Subsequent Event  
Total distribution 7,512
Amount to be distributed to third-party unitholders 7,323
Permian Trust
  
Subsequent Event  
Total distribution 30,555
Amount to be distributed to third-party unitholders 24,885
Mississippian Trust II
  
Subsequent Event  
Total distribution 18,125
Amount to be distributed to third-party unitholders $ 15,090