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Derivatives - Additional Information (Details) (USD $)	12 Months Ended						1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Mississippian Trust I	Dec. 31, 2013 Permian Trust	Dec. 31, 2013 Mississippian Trust II	Apr. 30, 2013 Senior Floating Rate Notes due 2014 Fixed To Floating Interest Rate Swap Through April 1st 2013	Dec. 31, 2013 Commodity Derivatives	Sep. 30, 2013 Commodity Derivatives	Jun. 30, 2013 Commodity Derivatives	Mar. 31, 2013 Commodity Derivatives	Dec. 31, 2012 Commodity Derivatives	Sep. 30, 2012 Commodity Derivatives	Jun. 30, 2012 Commodity Derivatives	Mar. 31, 2012 Commodity Derivatives	Dec. 31, 2013 Commodity Derivatives	Dec. 31, 2012 Commodity Derivatives	Dec. 31, 2011 Commodity Derivatives	Dec. 31, 2013 Interest rate swaps	Dec. 31, 2012 Interest rate swaps	Dec. 31, 2011 Interest rate swaps	Dec. 31, 2013 Cash Commodity Derivatives	Dec. 31, 2012 Cash Commodity Derivatives	Dec. 31, 2011 Cash Commodity Derivatives	Dec. 31, 2013 Cash Commodity Derivatives Derivative Contracts Early Settlements	Dec. 31, 2013 Cash Interest rate swaps	Dec. 31, 2012 Cash Interest rate swaps	Dec. 31, 2011 Cash Interest rate swaps	Dec. 31, 2012 Noncash Commodity Derivatives Amendment
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, maturity date							Apr. 01, 2013
Derivative liability, notional amount							$ 350,000,000
Derivative, fixed interest rate							6.69%
Derivative agreement effective date				Apr. 01, 2011	Aug. 01, 2011	Apr. 01, 2012
Commodity derivative contracts covering volumes of oil and gas production, date				Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Loss (gain) on derivative contracts	47,123,000	(241,419,000)	(44,075,000)					(22,900,000)	132,800,000	(103,700,000)	40,900,000	(19,600,000)	193,500,000	(669,900,000)	254,600,000	47,123,000	(241,419,000)	(44,075,000)				(3,200,000)	(100,700,000)	37,600,000	29,600,000				117,100,000
Interest expense	$ 270,234,000	$ 303,349,000	$ 237,332,000																$ 10,000	$ 1,200,000	$ 3,200,000					$ 2,400,000	$ 9,200,000	$ 9,400,000

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Date through which commodity derivatives cover oil and natural gas production for Trust.

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Fixed interest rate related to the interest rate derivative.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Nominal or face amount used to calculate payments on the derivative liability.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Interest and debt related expenses associated with nonoperating financing activities of the entity.

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