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Subsequent Events - Royalty Trust Distributions (Details) (Royalty Trust Distributions, USD $) In Thousands, unless otherwise specified	Apr. 24, 2014
Mississippian Trust I
Subsequent Event
Total Distribution	$ 8,952
Amount to be Distributed to Third-Party Unitholders	8,727
Permian Trust
Subsequent Event
Total Distribution	29,871
Amount to be Distributed to Third-Party Unitholders	23,940
Mississippian Trust II
Subsequent Event
Total Distribution	20,849
Amount to be Distributed to Third-Party Unitholders	17,357
Royalty Trusts
Subsequent Event
Total Distribution	59,672
Amount to be Distributed to Third-Party Unitholders	$ 50,024