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Variable Interest Entities - Royalty Trusts - Distributions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Variable Interest Entity    
Distributions to third-party unitholders $ 53,118 $ 51,256
Royalty Trusts
    
Variable Interest Entity    
Total distributions 68,313 [1] 76,361
Distributions to third-party unitholders $ 53,118 [1] $ 51,256
[1] Subordination thresholds were not met for the Mississippian Trust I’s and Mississippian Trust II’s distributions, resulting in reduced distributions to the Company on its subordinated units for this period.