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Variable Interest Entities - Royalty Trusts - Distributions (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Variable Interest Entity        
Distributions to third-party unitholders     $ 153,002 $ 127,023
Royalty Trusts
        
Variable Interest Entity        
Total distributions 81,594 [1] 75,246 226,404 [1] 193,262 [2]
Distributions to third-party unitholders $ 54,287 [1] $ 50,222 $ 153,002 [1] $ 127,023 [2]
[1] Subordination thresholds were not met for the Mississippian Trust I’s second and third quarter 2013 distributions and for the Permian Trust’s second quarter 2013 distribution, resulting in reduced distributions to the Company on its subordinated units for these periods.
[2] The Company received incentive distributions from the Mississippian Trust I during the nine-month period ended September 30, 2012.