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Subsequent Events - Royalty Trust Distributions (Details) (Subsequent Event, USD $) In Thousands, unless otherwise specified	Apr. 30, 2015
Mississippian Trust I
Subsequent Event
Total Distribution	$ 9,261
Amount Distributed to Third-Party Unitholders	6,770
Permian Trust
Subsequent Event
Total Distribution	27,221
Amount Distributed to Third-Party Unitholders	25,200
Mississippian Trust II
Subsequent Event
Total Distribution	10,815
Amount Distributed to Third-Party Unitholders	9,005
Royalty Trusts
Subsequent Event
Total Distribution	47,297
Amount Distributed to Third-Party Unitholders	$ 40,975