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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 |  |  |  |

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- 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 + Details
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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 + Details
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