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Variable Interest Entities - Royalty Trusts - Distributions (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Variable Interest Entity [Line Items]      
Distributions to third-party unitholders $ 206,470 $ 181,727 $ 60,200
Royalty Trusts
      
Variable Interest Entity [Line Items]      
Total distributions 299,674 [1] 274,979 [2] 91,162
Distributions to third-party unitholders $ 206,470 [1] $ 181,727 [2] $ 57,449
[1] Subordination thresholds were not met for the Mississippian Trust I’s second and third quarter 2013 distributions or 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 first and second quarters of 2012 and the third quarter of 2011.