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Debt - Pre-Emergence Indebtedness (Details) - USD ($) shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 11, 2016 | Jun. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Apr. 20, 2016 | Mar. 11, 2016 | Mar. 10, 2016 | Dec. 31, 2015 | Oct. 31, 2015
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Debt issued |  |  | $ 0 |  | $ 0 |  |  |  |  | $ 3,562,378,000 |
Common stock issued for debt exchange (in shares) |  |  |  |  | 84.4 |  |  |  |  |  |
Aggregate cash payments for early conversion |  |  |  |  | $ 33,500,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 0 | $ 340,699,000 | 41,179,000 | $ 358,633,000 |  |  |  |  |
Write off of debt issuance costs |  |  |  |  | 0 | 7,108,000 |  |  |  |  |
Conversion Of Senior Notes To Common Stock |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | 41,300,000 |  |  |  |  |  |
Write off of debt issuance costs |  |  |  |  | $ 4,300,000 |  |  |  |  |  |
8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  | 8.125% |  | 8.125% |  |  |  |  |  |
7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  | 7.50% |  | 7.50% |  |  |  |  |  |
Senior credit facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Ratio of secured debt to EBITDA |  |  | 2.00 |  | 2.00 |  |  |  |  |  |
Minimum current ratio |  |  | 1.0 |  | 1.0 |  |  |  |  |  |
Number of days prior to earliest maturity date or mandatory offer of repurchase |  |  |  |  | 91 days |  |  |  |  |  |
Allowed repurchases of outstanding debt |  |  | $ 275,000,000 |  | $ 275,000,000 |  |  |  |  |  |
Percentage of proved reserves pledged as collateral |  |  | 80.00% |  | 80.00% |  |  |  |  |  |
Borrowing base |  |  |  |  |  |  | $ 500,000,000 | $ 340,000,000 | $ 500,000,000 |  |
Carrying value |  |  | $ 449,200,000 |  | $ 449,200,000 |  |  |  |  |  |
Outstanding letters of credit |  |  | 9,900,000 |  | $ 9,900,000 |  |  |  |  |  |
Senior credit facility | Plan of Reorganization |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Repayments of debt | $ 40,000,000 |  |  |  |  |  |  |  |  |  |
Senior credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Unused capacity, commitment fee percentage |  |  |  |  | 0.50% |  |  |  |  |  |
Senior credit facility | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% |  |  |  |  |  |
Senior credit facility | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.75% |  |  |  |  |  |
Senior credit facility | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.50% |  |  |  |  |  |
Senior credit facility | One-Month Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.00% |  |  |  |  |  |
Senior credit facility | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.75% |  |  |  |  |  |
Senior credit facility | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% |  |  |  |  |  |
Senior Secured Notes | 8.75% Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  | 1,328,000,000 |  | $ 1,328,000,000 |  |  |  |  | $ 1,265,814,000 |
Debt issued |  |  | $ 1,300,000,000 |  | $ 1,300,000,000 |  |  |  |  |  |
Face amount of debt instrument |  |  |  | $ 1,250,000,000.0 |  | $ 1,250,000,000.0 |  |  |  |  | $ 78,000,000.0
Proceeds from issuance of debt, net of issuance costs |  | $ 1,210,000,000 |  |  |  |  |  |  |  |  |
Fair value of debt |  |  |  |  |  |  |  |  |  |  | $ 50,300,000
Long-term debt, fixed interest rate |  |  | 8.75% |  | 8.75% |  |  |  |  |  |
Senior Unsecured Notes | 8.75% Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  | 8.75% |  | 8.75% |  |  |  |  | 8.75% |
Senior Unsecured Notes | 8.75% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  | $ 395,935,000 |  | $ 395,935,000 |  |  |  |  | $ 389,232,000 |
Long-term debt, fixed interest rate |  |  | 8.75% |  | 8.75% |  |  |  |  | 8.75% |
Aggregate outstanding principal amount |  |  | $ 100,000,000 |  | $ 100,000,000 |  |  |  |  |  |
Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  | 8.125% |  | 8.125% |  |  |  |  | 8.125% |
Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  | 7.50% |  | 7.50% |  |  |  |  | 7.50% |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | $ 232,100,000 |  |  |  |  |  |
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  | $ 40,694,000 |  | $ 40,694,000 |  |  |  |  | $ 78,290,000 |
Long-term debt, fixed interest rate |  |  | 8.125% | 8.125% | 8.125% | 8.125% |  |  |  |  |
Notes exchanged/converted |  |  | $ 0 |  | $ 200,500,000 |  |  |  |  |  |
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised |  |  |  |  | 67,400,000 |  |  |  |  |  |
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |
Carrying value |  |  | $ 46,900,000 |  | $ 46,900,000 |  |  |  |  | $ 24,393,000 |
Long-term debt, fixed interest rate |  |  | 7.50% | 7.50% | 7.50% | 7.50% |  |  |  |  |
Notes exchanged/converted |  |  |  |  | $ 31,600,000 |  |  |  |  |  |
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised |  |  |  |  | $ 10,400,000 |  |  |  |  |  |

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