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Fair Value Measurements - Narrative (Details) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2015 | Aug. 31, 2015 | Jun. 30, 2015 | Sep. 30, 2014
Gulf Properties |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |
Fair value inputs, probability of default | 3.71% |  |  |  |
8.125% Convertible Senior Notes due 2022 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |
Long-term debt, fixed interest rate |  | 8.125% |  |  |
7.5% Convertible Senior Notes due 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |
Long-term debt, fixed interest rate |  | 7.50% |  |  |
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |
Long-term debt, fixed interest rate |  | 8.125% | 8.125% |  |
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |
Long-term debt, fixed interest rate |  | 7.50% | 7.50% |  |
Commodity derivative contracts |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |  |  |
Outstanding Level 3 commodity derivative contract | $ 350,000 | $ (3,436,000) |  | $ (2,207,000) | $ 0

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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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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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