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Subsequent Events - Narrative (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 04, 2015 USD ($) shares | Nov. 03, 2015 USD ($) a well | Oct. 31, 2015 USD ($) mi shares | Aug. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) shares | Jun. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) shares | Sep. 30, 2014 USD ($) | Dec. 31, 2014 shares
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  |  | $ 35,147,000 | $ 0 |
Common stock issued for debt exchange (in shares) | shares |  |  |  |  | 8,000,000 |  |  |  |
Aggregate cash payments for early conversion |  |  |  |  | $ 2,700,000 |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) | shares | 37,900,000 |  |  |  |  |  |  |  |
Aggregate cash payments for early conversion | $ 12,900,000 |  |  |  |  |  |  |  |
PGC | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Acquisition, cash consideration |  |  | $ 48,000,000 |  |  |  |  |  |
Acquisition, liability incurred |  |  | $ 78,000,000 |  |  |  |  |  |
Number of miles of gathering lines acquired | mi |  |  | 370 |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
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 | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | $ 100,000,000 |  |  |  |  |  |
Cash paid to repurchase debt |  |  | (30,000,000) |  |  |  |  |  |
Notes exchanged/converted |  |  | 300,000,000 |  |  |  |  |  |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | 21,900,000 |  |  |  |
8.75% Senior Notes due 2020 | Senior Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  |  | 29,300,000 |  |  |  |  |
Notes exchanged/converted |  |  |  | 15,900,000 |  |  |  |  |
8.75% Senior Notes due 2020 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | 2,200,000 |  |  |  |  |  |
Notes exchanged/converted |  |  | 6,600,000 |  |  |  |  |  |
7.5% Senior Notes due 2021 | Senior Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  |  | 111,600,000 |  |  |  |  |
Notes exchanged/converted |  |  |  | 40,700,000 |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  | $ 29,000,000 |  |  |
7.5% Senior Notes due 2021 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | 46,600,000 |  |  |  |  |  |
Notes exchanged/converted |  |  | 189,300,000 |  |  |  |  |  |
8.125% Senior Notes due 2022 | Senior Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  |  | 26,100,000 |  |  |  |  |
Notes exchanged/converted |  |  |  | 101,800,000 |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  |  |  | $ 21,000,000 |  |  |
8.125% Senior Notes due 2022 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  | 73,500,000 |  |  |  |  |  |
7.5% Senior Notes due 2023 | Senior Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  |  | 83,000,000 |  |  |  |  |
Notes exchanged/converted |  |  |  | 116,600,000 |  |  |  |  |
7.5% Senior Notes due 2023 | Senior Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Aggregate principal amount of debt repurchased |  |  | 51,200,000 |  |  |  |  |  |
Notes exchanged/converted |  |  | 30,600,000 |  |  |  |  |  |
8.125% Convertible Senior Notes due 2022 | Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | 19,400,000 |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  | 158,400,000 |  |  |  |  |
8.125% Convertible Senior Notes due 2022 | Convertible Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Notes exchanged/converted | 97,200,000 |  |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  | 269,400,000 |  |  |  |  |  |
7.5% Convertible Senior Notes due 2023 | Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Notes exchanged/converted |  |  |  |  | $ 2,500,000 |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  |  | $ 116,600,000 |  |  |  |  |
7.5% Convertible Senior Notes due 2023 | Convertible Senior Unsecured Notes | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Notes exchanged/converted | $ 6,900,000 |  |  |  |  |  |  |  |
Aggregate principal amount of convertible senior notes issued in debt exchange |  |  | $ 30,600,000 |  |  |  |  |  |
7.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | shares |  |  |  |  | 3,000,000 |  | 3,000,000 |  | 3,000,000
7.0% Convertible perpetual preferred stock | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Preferred stock, shares outstanding | shares |  |  | 216,000 |  |  |  |  |  |
Shares of common stock issued related to the conversion of preferred stock (in shares) | shares |  |  | 2,800,000 |  |  |  |  |  |
North Park Basin, Jackson County, Colorado | Acquisition Of Oil And Natural Gas Assets | Subsequent Event |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |
Number of wells acquired | well |  | 16 |  |  |  |  |  |  |
Number of acres acquired | a |  | 136,000 |  |  |  |  |  |  |
Consideration |  | $ 190,000,000 |  |  |  |  |  |  |

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