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Subsequent Events - Narrative (Details) $ in Thousands, shares in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2016 USD ($) | Mar. 15, 2016 USD ($) | Jan. 21, 2016 USD ($) | Feb. 29, 2016 USD ($) | Jan. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) | Aug. 31, 2015 USD ($) | Mar. 20, 2016 USD ($) shares | Dec. 31, 2015 USD ($) MMBoe shares | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Mar. 21, 2016 USD ($) | Mar. 11, 2016 USD ($) | Feb. 16, 2016 | Jun. 09, 2015 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  |  |  |  |  |  | $ 12,451 | $ 8,874 | $ 122,505 |  |  |  |
Senior credit facility, borrowed amount |  |  |  |  |  |  |  |  | $ 0 | 0 |  |  |  |  |
Debt instrument, subjective acceleration clause, period |  |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |
Cash paid, transfer of ownership of substantially all of oil and natural gas properties and midstream assets in Pinon and release from all past, current and future claims and obligations under existing agreement |  |  |  |  |  |  |  |  | $ 24,889 | $ 0 | $ 0 |  |  |  |
Common stock issued for debt (in shares) | shares |  |  |  |  |  |  |  |  | 92.8 |  |  |  |  |  |
Aggregate cash payments for accrued interest and early conversion of debt |  |  |  |  |  |  |  |  | $ 30,500 |  |  |  |  |  |
Treating Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract agreement, term |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |
Cumulative shortfall accrued |  |  |  |  |  |  |  |  | $ 109,900 |  |  |  |  |  |
Shortfall incurred in period |  |  |  |  |  |  |  |  | $ 34,900 |  |  |  |  |  |
Discontinued Operations, Disposed of by Means Other than Sale | WTO Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Production, oil and natural gas (in MMBoe) | MMBoe |  |  |  |  |  |  |  |  | 1.9 |  |  |  |  |  |
Proved reserves, oil and natural gas (in MMBoe) | MMBoe |  |  |  |  |  |  |  |  | 24.6 |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 14,600 |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 41,100 |  |  |  |  |  |
Senior credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900,000
Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  | $ 300,000 | $ 275,000 |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  |  |  |  | 255,300 |  |  |  |  |  |
June Amendment | Senior credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  | $ 500,000 |  |  |  |  |  |
8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  |  | 8.50% | 8.50% | 8.50% |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee termination benefits |  |  |  | $ 17,400 |  |  |  |  |  |  |  |  |  |  |
Senior credit facility, borrowed amount |  |  |  |  | $ 488,900 |  |  |  |  |  |  |  |  |  |
Common stock issued for debt (in shares) | shares |  |  |  |  |  |  |  | 84.4 |  |  |  |  |  |  |
Aggregate cash payments for accrued interest and early conversion of debt |  |  |  |  |  |  |  | $ 33,500 |  |  |  |  |  |  |
Subsequent Event | Treating Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract agreement, term |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Discontinued Operations, Disposed of by Means Other than Sale | WTO Properties |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid, transfer of ownership of substantially all of oil and natural gas properties and midstream assets in Pinon and release from all past, current and future claims and obligations under existing agreement |  |  | $ 11,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Performance Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive plan, payout percentages of target values |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |
Subsequent Event | Performance Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive plan, payout percentages of target values |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |  |
Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments |  | $ 22,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | June Amendment | Senior credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  | $ 340,000 |  |
Line of credit facility, target borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 |  |  |
Subsequent Event | 8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |
7.5% Senior Notes due 2023 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  | 7.50% | 7.50% |  | 7.50% | 7.50% |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  | $ 30,600 | $ 116,600 |  |  |  |  |  |  |  |
7.5% Senior Notes due 2023 | Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.50% |
7.5% Senior Notes due 2021 | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  | 7.50% | 7.50% |  | 7.50% | 7.50% |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  | $ 189,300 | $ 40,700 |  |  |  |  |  |  |  |
7.5% Senior Notes due 2021 | Subsequent Event | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest payments | $ 28,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
8.125% Convertible Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  |  |  |  | 8.125% |  |  |  |  |  |
8.125% Convertible Senior Notes due 2022 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  | 8.125% | 8.125% |  | 8.125% | 8.125% |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  |  |  |  | $ 186,600 |  |  |  |  |  |
8.125% Convertible Senior Notes due 2022 | Subsequent Event | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  |  |  | 200,500 |  |  |  |  |  |  |
7.5% Convertible Senior Notes due 2023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  |  |  |  | 7.50% |  |  |  |  |  |
7.5% Convertible Senior Notes due 2023 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fixed interest rate |  |  |  |  |  | 7.50% | 7.50% |  | 7.50% | 7.50% |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  |  |  |  | $ 68,700 |  |  |  |  |  |
7.5% Convertible Senior Notes due 2023 | Subsequent Event | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion, original debt, amount |  |  |  |  |  |  |  | $ 31,600 |  |  |  |  |  |  |

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