Unit-Based Compensation (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation Expense	$ 5,578,000	$ 3,146,000	$ 16,759,000	$ 10,546,000
Income tax benefit	2,061,000	1,162,000	6,192,000	3,897,000
Share-based compensation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted units granted to employees (in shares)			1,089,502
Aggregate fair value of restricted units issued to employees			42,000,000
Vesting period of restricted units granted to employees (in years)			three
Share-based Compensation Expense Recorded in General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation Expense	5,320,000	3,070,000	16,014,000	10,280,000
Share-based Compensation Expense Recorded in Lease Operating Expenses[Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share Based Compensation Expense	$ 258,000	$ 76,000	$ 745,000	$ 266,000

The income tax benefit associated with share-based compensation expense for the period.

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The aggregate fair value of the restricted units awarded as part of the review of employee compensation.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph A240

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-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.

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-Publisher FASB

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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