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Long-Term Debt - Narrative (Details) $ / shares in Units, shares in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 10, 2015 USD ($) | Aug. 31, 2015 USD ($) $ / shares | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) shares | Jun. 30, 2015 USD ($) shares | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Aug. 13, 2015 USD ($) | Jun. 09, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of debt issuance costs |  |  |  |  |  |  |  |  | $ 7,108,000 |  | $ 0 |  |  |
Carrying Value |  |  |  |  | $ 3,936,994,000 |  |  |  | 3,936,994,000 |  |  |  |  | $ 3,195,436,000
Common stock issued for debt exchange (in shares) | shares |  |  |  |  | 8.0 |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  |  |  |  | 35,147,000 |  | 0 |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ 340,699,000 |  |  | $ 0 | $ 358,633,000 |  | $ 0 |  |  |
Aggregate cash payments for early conversion |  |  |  |  | $ 2,700,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing base |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000,000 |
June Amendment | Senior credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Borrowing base |  |  |  |  | $ 500,000,000 |  |  |  | $ 500,000,000 |  |  |  |  |
Write off of debt issuance costs |  | 4,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Additional aggregate principal indebtedness permitted (less than) |  | 1,750,000,000.00 |  |  |  |  |  |  |  |  |  |  |  |
Reduction in borrowing base for every $1 junior lien debt incurred |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |
August 2015 Amendment | Senior credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowed repurchases of outstanding debt |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |
Senior credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant ratio of secured debt To EBITDA, maximum |  |  |  |  |  |  |  |  |  |  |  |  | 2.25 |
Covenant, Ratio of EBITDA to interest expense at Mar 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 |
Covenant, Ratio of EBITDA to interest expense at Jun 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 |
Covenant, Ratio of EBITDA to interest expense at Sep 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 1.75 |
Covenant, Ratio of EBITDA to interest expense at Dec 2015 |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 |
Covenant, Ratio of EBITDA to interest expense at Mar 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 |
Covenant, Ratio of EBITDA to interest expense at June 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 |
Covenant, Ratio of EBITDA to interest expense at Sep 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 1.50 |
Covenant, Ratio of EBITDA to interest expense at Dec 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 2.00 |
Current assets to current liabilities, ratio minimum |  |  |  |  |  |  |  |  |  |  |  |  | 1.00 |
Covenant, Ratio of total net debt to EBITDA at Jun 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 6.25 |
Covenant, Ratio of total net debt to EBITDA at Sep 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 6.00 |
Covenant, Ratio of total net debt to EBITDA at Dec 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 6.00 |
Covenant, Ratio of total net debt to EBITDA at Mar 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 5.50 |
Covenant, Ratio of total net debt to EBITDA at Jun 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 5.50 |
Covenant, Ratio of total net debt to EBITDA at Sep 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 5.00 |
Covenant, Ratio of total net debt to EBITDA at Dec 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 5.00 |
Covenant, Ratio of total net debt to EBITDA at Mar 2018 |  |  |  |  |  |  |  |  |  |  |  |  | 4.50 |
Outstanding letters of credit |  |  |  |  | $ 11,000,000 |  |  |  | $ 11,000,000 |  |  |  |  |
Senior credit facility | June Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covenant ratio of secured debt To EBITDA, maximum |  |  |  |  | 2.00 |  |  |  | 2.00 |  |  |  |  |
Current assets to current liabilities, ratio minimum |  |  |  |  | 1.0 |  |  |  | 1.0 |  |  |  |  |
Minimum collateral amount of proved oil, natural gas and NGL reserves representing the discounted present value of reserves used in borrowing base determination |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unused capacity, commitment fee percentage |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.75% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | One-Month Eurodollar Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | Base Rate | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.75% |  |  |  |  |  |  |  |  |  |  |  |
Senior credit facility | June Amendment | Base Rate | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.75% |  |  |  |  |  |  |  |  |  |  |  |
Junior lien debt | June Amendment |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding junior debt threshold, reduction of maximum borrowing base |  | $ 1,500,000,000.00 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 1,250,000,000.0 |  |  | $ 1,250,000,000.0 |  |  |  |  |  |  |
Proceeds from issuance of debt, net of issuance costs |  |  |  | $ 1,210,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  | 8.75% |  |  |  | 8.75% |  |  |  |  |
Senior Secured Notes | 8.75% Senior Secured Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  | $ 1,250,000,000 |  |  |  | $ 1,250,000,000 |  |  |  |  | 0
Long-term debt, fixed interest rate |  |  |  |  | 8.75% |  |  |  | 8.75% |  |  |  |  |
Debt issuance costs |  |  |  |  | $ 39,200,000 |  |  |  | $ 39,200,000 |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of debt issuance costs |  |  |  |  | 3,200,000 |  |  |  | 3,200,000 |  |  |  |  |
Debt issuance costs |  |  |  |  | 57,600,000 |  |  |  | 57,600,000 |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | 152,000,000 |  |  |  | 152,000,000 |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Cash paid to repurchase debt |  |  | 94,500,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  | 275,000,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 8.125% Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  | $ 601,187,000 |  |  |  | $ 601,187,000 |  |  |  |  | $ 750,000,000
Long-term debt, fixed interest rate |  |  |  |  | 8.125% |  |  |  | 8.125% |  |  |  |  | 8.125%
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  |  | $ 21,000,000 |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | 26,100,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  | 101,800,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 7.5% Senior Notes due 2021 and 8.125% Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) | shares |  |  |  |  |  |  | 28.0 |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | $ 17,900,000 |  |  |  |  |
Notes exchanged/converted |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |
Senior Notes | 7.5% Senior Notes due 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | [1] |  |  |  | $ 996,309,000 |  |  |  | $ 996,309,000 |  |  |  |  | $ 1,178,486,000
Long-term debt, fixed interest rate |  |  |  |  | 7.50% |  |  |  | 7.50% |  |  |  |  | 7.50%
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  |  | $ 29,000,000 |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | 111,600,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  | 40,700,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 8.75% Senior Notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | [2] |  |  |  | $ 401,149,000 |  |  |  | $ 401,149,000 |  |  |  |  | $ 445,402,000
Long-term debt, fixed interest rate |  |  |  |  | 8.75% |  |  |  | 8.75% |  |  |  |  | 8.75%
Aggregate outstanding principal amount of 8.75% senior notes due 2020 that would adjust maturity date of 8.75% senior secured notes due 2020 |  |  |  |  | $ 100,000,000 |  |  |  | $ 100,000,000 |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | 29,300,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  | 15,900,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 7.5% Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value | [3] |  |  |  | $ 622,923,000 |  |  |  | $ 622,923,000 |  |  |  |  | $ 821,548,000
Long-term debt, fixed interest rate |  |  |  |  | 7.50% |  |  |  | 7.50% |  |  |  |  | 7.50%
Aggregate principal amount of debt repurchased |  |  | 83,000,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  | $ 116,600,000 |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of debt issuance costs |  |  |  |  | $ 500,000 |  |  |  | $ 500,000 |  |  |  |  |
Debt issuance costs |  |  |  |  | 5,900,000 |  |  |  | 5,900,000 |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | (300,000) |  |  |  | (300,000) |  |  |  |  |
Notes exchanged/converted |  |  |  |  | 21,900,000 |  |  |  |  |  |  |  |  |
Conversion rate |  |  | 0.3636 |  |  |  |  |  |  |  |  |  |  |
Percentage of applicable conversion price threshold |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |
Conversion price threshold (usd per share) | $ / shares |  |  | $ 1.10 |  |  |  |  |  |  |  |  |  |  |
Convertible Senior Unsecured Notes | 8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  | $ 36,406,000 | [4] |  |  | $ 36,406,000 | [4] |  |  |  | $ 0
Long-term debt, fixed interest rate |  |  | 8.125% |  | 8.125% |  |  |  | 8.125% |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  | $ 158,400,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | $ 19,400,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised |  |  |  |  | 5,800,000 |  |  |  |  |  |  |  |  |
Convertible Senior Unsecured Notes | 7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying Value |  |  |  |  | $ 29,020,000 | [5] |  |  | $ 29,020,000 | [5] |  |  |  | $ 0
Long-term debt, fixed interest rate |  |  | 7.50% |  | 7.50% |  |  |  | 7.50% |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  | $ 116,600,000 |  |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | $ 2,500,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible debt net of discount and including holders' conversion feature exercised |  |  |  |  | 700,000 |  |  |  |  |  |  |  |  |
Senior Notes And Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write off of debt issuance costs |  |  |  |  | 4,000,000 |  |  |  | $ 4,000,000 |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ 189,000,000 |  |  |  | $ 189,000,000 |  |  |  |  |
[1] | Carrying value includes a premium of $2,652 and $3,486 at September 30, 2015 and December 31, 2014, respectively.
[2] | Carrying value is net of $3,649 and $4,598 discount at September 30, 2015 and December 31, 2014, respectively.
[3] | Carrying value is net of $2,436 and $3,452 discount at September 30, 2015 and December 31, 2014, respectively.
[4] | Carrying value includes holder conversion feature liabilities with fair value of $3,113 and is net of $105,691 discount at September 30, 2015.
[5] | Carrying value includes holder conversion feature liabilities with fair value of $2,361 and is net of $87,412 discount at September 30, 2015.

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