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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Commodity derivative contracts, assets, net of offset | $ 84,349 | $ 338,417
Commodity derivative contracts, liabilities, net of offset | 573 | 0
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Netting adjustment, assets | (1,175) | 0
Commodity derivative contracts, assets, net of offset | 84,349 | 338,417
Investments | 10,106 | 11,106
Assets measured at fair value | 94,455 | 349,523
Guarantee |  | 5,104
Netting adjustments, liabilities | (1,175) | 0
Commodity derivative contracts, liabilities, net of offset | 573 |
Liabilities measured at fair value | 32,869 | 5,104
Fair Value, Measurements, Recurring | Long-term debt holder conversion feature |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 29,355 |
Fair Value, Measurements, Recurring | Mandatory prepayment feature - PGC Senior Secured Notes |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 2,941 |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Commodity derivative contracts, assets, before netting | 0 | 0
Investments | 10,106 | 11,106
Assets measured at fair value | 10,106 | 11,106
Guarantee |  | 0
Commodity derivative contracts, liabilities, before netting | 0 |
Liabilities measured at fair value | 0 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 | Long-term debt holder conversion feature |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 0 |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 | Mandatory prepayment feature - PGC Senior Secured Notes |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 0 |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Commodity derivative contracts, assets, before netting | 85,524 | 338,067
Investments | 0 | 0
Assets measured at fair value | 85,524 | 338,067
Guarantee |  | 0
Commodity derivative contracts, liabilities, before netting | 0 |
Liabilities measured at fair value | 2,941 | 0
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 | Long-term debt holder conversion feature |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 0 |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 | Mandatory prepayment feature - PGC Senior Secured Notes |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 2,941 |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Commodity derivative contracts, assets, before netting | 0 | 350
Investments | 0 | 0
Assets measured at fair value | 0 | 350
Guarantee |  | 5,104
Commodity derivative contracts, liabilities, before netting | 1,748 |
Liabilities measured at fair value | 31,103 | $ 5,104
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 | Long-term debt holder conversion feature |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | 29,355 |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 3 | Mandatory prepayment feature - PGC Senior Secured Notes |  |
Fair Value Assets And Liabilities Measured On Recurring Basis |  |
Derivative liability, not subject to netting | $ 0 |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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