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Equity - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2015 USD ($) | Aug. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) $ / shares shares | Jun. 30, 2015 $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 | Nov. 29, 2012 right
Common Stock |  |  |  |  |  |  |  |
Shares authorized (in shares) |  |  | 800,000,000 | 1,800,000,000.0 | 1,800,000,000 | 800,000,000 |  |
Preferred stock, shares authorized (in shares) |  |  | 50,000,000 | 50,000,000 | 50,000,000 | 50,000,000 |  |
Common stock issued for debt (in shares) |  |  |  |  | 92,800,000 |  |  |
Shares repurchased then retired during period (in shares) |  |  |  |  |  | 27,400,000 |  |
Shares repurchased then retired during period, value | $ |  |  |  |  |  | $ 111,300,000 |  |
Broker fees and commission for shares repurchased, then retired | $ |  |  |  |  |  | 500,000 |  |
Additional paid-in capital—stockholder receivable | $ |  |  | $ 2,500,000 |  | $ 1,250,000 | 2,500,000 |  |
2014 Share Repurchase Program |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Share repurchase program, maximum authorized amount | $ |  |  | $ 200,000,000.0 |  |  | $ 200,000,000.0 |  |
6.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  | 6.00% | 6.00% |
Shares of common stock issued related to conversion of preferred stock (in shares) |  |  | 18,400,000 |  |  |  |  |
Series A Junior Participating Preferred Stock | Stockholder Rights Plan |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Number of Rights issued per common share | right |  |  |  |  |  |  |  | 1
Common Stock and Preferred Stock |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Shares authorized |  |  | 850,000,000 | 1,850,000,000 |  | 850,000,000 |  |
Shares authorized, par value (usd per share) | $ / shares |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  |
Common Stock |  |  |  |  |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |
Shares of common stock issued related to conversion of preferred stock (in shares) |  |  |  |  | 2,968,000 | 18,423,000 |  |
Common Stock |  |  |  |  |  |  |  |
Common stock issued for debt (in shares) |  |  |  |  | 120,881,000 |  |  |
Senior Notes |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Debt conversion, original debt, amount | $ | $ 300,000,000 | $ 275,000,000 |  |  |  |  |  |
Senior Notes | Common Stock |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Common stock issued for debt (in shares) |  |  |  |  | 28,000,000 |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Debt conversion, original debt, amount | $ |  |  |  |  | $ 255,300,000 |  |  |
Convertible Debt | Common Stock |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Common stock issued for debt (in shares) |  |  |  |  | 92,800,000 |  |  |
7.5% Senior Notes Due 2021 And 8.125% Senior Notes Due 2022 | Senior Notes |  |  |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |
Common stock issued for debt (in shares) |  |  |  | 28,000,000 |  |  |  |
Debt conversion, original debt, amount | $ |  |  |  |  | $ 50,000,000 |  |  |

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