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Subsequent Events - Additional Information (Details) (USD $)						1 Months Ended					12 Months Ended	1 Months Ended
	Dec. 31, 2012 9.875% Senior Notes due 2016	Dec. 31, 2011 9.875% Senior Notes due 2016	Dec. 31, 2012 8.0% Senior Notes due 2018	Dec. 31, 2011 8.0% Senior Notes due 2018	Jan. 31, 2013 Royalty Trust Distributions Royalty Trusts	Feb. 28, 2013 Permian Properties	Dec. 31, 2012 Permian Properties	Dec. 31, 2012 Redemption of Senior Notes	Dec. 31, 2012 Redemption of Senior Notes 9.875% Senior Notes due 2016	Dec. 31, 2012 Redemption of Senior Notes 8.0% Senior Notes due 2018	Dec. 31, 2011 Derivative Contracts Early Settlements Commodity Derivatives	Feb. 28, 2013 Derivative Contracts Early Settlements Commodity Derivatives Permian Properties
Subsequent Event [Line Items]
Expected distribution date					3/1/2013
Distributions record date					2/14/2013
Proceeds from sale of oil and natural gas properties						$ 2,600,000,000
Pro forma loss on sale of oil and natural gas properties							450,000,000
Realized loss on derivatives											62,900,000	30,000,000
Long-term debt, fixed interest rate	9.875%	9.875%	8.00%	8.00%					9.875%	8.00%
Aggregate principal outstanding								$ 1,100,000,000

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Distribution Record Date

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Expected date of distribution from Royalty Trust.

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Realized Loss on Derivatives

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The gain (loss) on a significant divestiture that occurred or is probable of occurring after the balance sheet date as if the divestiture had been completed on the balance sheet date.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The cash inflow to dispose of long-lived, physical assets and mineral interests in oil and gas properties used for normal oil and gas operations.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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