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Fair Value Measurements - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2015	Oct. 31, 2015	Aug. 31, 2015	Jun. 30, 2015
Gulf Properties
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value inputs, probability of default	3.71%
Secured Debt | 8.75% Senior Secured Notes Due 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Debt instrument, face amount		$ 1,300,000,000	$ 78,000,000.0		$ 1,250,000,000.0
Long-term debt, fixed interest rate		8.75%			8.75%
Senior Notes | 8.75% Senior Notes due 2020
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Long-term debt, fixed interest rate	8.75%	8.75%	8.75%	8.75%
Mandatory prepayment feature, threshold amount of outstanding principal amount of senior notes		$ 100,000,000
Fair Value Measurements Level 3 | Gulf Properties
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Estimate of future payments for plugging and abandonment	$ 372,000,000

X

- Definition

Debt Instrument, Aggregate Outstanding Principal Amount, Threshold Adjusting Maturity Date Of Secured Notes

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- Definition

Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]

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- Definition

Estimated cash flows used as an input to measure fair value.

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X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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