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Derivatives - Additional Information (Details) (USD $)	3 Months Ended		6 Months Ended					1 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Mississippian Trust I	Jun. 30, 2014 Permian Trust	Jun. 30, 2014 Mississippian Trust II	Apr. 30, 2013 Senior Floating Rate Notes due 2014 Fixed To Floating Interest Rate Swap Through April 1st 2013	Jun. 30, 2014 Commodity Derivatives	Jun. 30, 2013 Commodity Derivatives	Jun. 30, 2014 Commodity Derivatives	Jun. 30, 2013 Commodity Derivatives	Jun. 30, 2014 Cash Commodity Derivatives	Jun. 30, 2013 Cash Commodity Derivatives	Jun. 30, 2014 Cash Commodity Derivatives	Jun. 30, 2013 Cash Commodity Derivatives	Jun. 30, 2014 Cash Commodity Derivatives Early Settlements	Jun. 30, 2013 Cash Commodity Derivatives Early Settlements
Derivative Instruments and Hedging Activities Disclosure
Contract period end								Apr. 01, 2013
Notional amount of interest rate swaps								$ 350,000,000
Derivative, fixed interest rate								6.69%
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	$ 85,292,000	$ (103,654,000)	$ 127,783,000	$ (62,757,000)					$ 85,292,000	$ (103,654,000)	$ 127,783,000	$ (62,757,000)	$ 13,100,000	$ (18,100,000)	$ 96,400,000	$ 300,000	$ 69,600,000	$ 29,000,000

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

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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

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-Section 50

-Paragraph 1A

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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5579245-113959



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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

-URI http://asc.fasb.org/extlink&oid=6519104

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

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