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Equity - Narrative (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) installment $ / shares shares | Jun. 30, 2015 $ / shares shares | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) $ / shares shares | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) installment $ / shares shares | Sep. 30, 2014 USD ($) | Aug. 17, 2015 $ / shares | May. 15, 2015 $ / shares
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 1,800,000,000 |  |  | 800,000,000 |  | 1,800,000,000 |  |  |
Preferred stock, shares authorized |  | 50,000,000 |  |  | 50,000,000 |  | 50,000,000 |  |  |
Common stock issued for debt exchange (in shares) |  | 8,000,000 |  |  |  |  |  |  |  |
Reduction to preferred stock dividends | $ |  | $ 9,114 |  |  |  | $ 11,381 | $ 27,069 | $ 39,144 |  |
Additional paid-in capital—stockholder receivable | $ |  | $ 2,500 |  |  | $ 2,500 |  | $ 2,500 |  |  |
Shareholder receivable, number of annual installments | installment |  | 2 |  |  |  |  | 2 |  |  |
8.5% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  | 8.50% | 8.50% |  |
Cash dividends | $ |  |  |  | $ 11,300 |  |  |  |  |  |
Dividends declared, per share (usd per share) | $ / shares |  | $ 4.25 |  |  |  |  |  |  |  |
Convertible perpetual preferred stock dividends, common stock issued (in shares) |  | 18,600,000 |  |  |  |  |  |  |  |
Number of trading days used in calculation of value of shares issued |  |  |  |  |  |  | 15 days |  |  |
Percentage multiplier used in calculation of value of shares issued |  |  |  |  |  |  | 95.00% |  |  |
Market value of common stock issued as dividends | $ |  |  |  |  |  |  | $ 9,500 |  |  |
Common stock issued, value per preferred share (usd per share) | $ / shares |  |  |  |  |  |  |  |  | $ 3.58 |
Preferred stock, shares outstanding |  | 2,650,000 |  |  | 2,650,000 |  | 2,650,000 |  |  |
Reduction to preferred stock dividends | $ |  | $ 1,800 |  |  |  |  | $ 1,800 |  |  |
7.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  | 7.00% | 7.00% |  |
Dividends declared, per share (usd per share) | $ / shares |  |  |  |  |  |  | $ 3.50 |  |  |
Convertible perpetual preferred stock dividends, common stock issued (in shares) |  |  |  |  |  |  | 5,700,000 |  |  |
Number of trading days used in calculation of value of shares issued |  |  |  |  |  |  | 15 days |  |  |
Percentage multiplier used in calculation of value of shares issued |  |  |  |  |  |  | 95.00% |  |  |
Market value of common stock issued as dividends | $ |  |  |  |  |  |  | $ 6,700 |  |  |
Common stock issued, value per preferred share (usd per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.23
Preferred stock, shares outstanding |  | 3,000,000 |  |  | 3,000,000 |  | 3,000,000 |  |  |
Reduction to preferred stock dividends | $ |  | $ 3,800 |  |  |  |  | $ 3,800 |  |  |
6.0% Convertible perpetual preferred stock |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  |  |  |  |  | 6.00% |  |
Shares of common stock issued related to the conversion of preferred stock (in shares) |  |  |  |  | 18,400,000 |  |  |  |  |
Convertible Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted | $ |  | $ 21,900 |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Notes exchanged/converted | $ | $ 275,000 |  |  |  |  |  |  |  |  |
Senior Notes | 7.5% Senior Notes due 2021 and 8.125% Senior Notes due 2022 |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  |  | 28,000,000 |  |  |  |  |  |  |
Notes exchanged/converted | $ |  |  |  |  |  |  | $ 50,000 |  |  |
Common and Preferred Stock |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  | 1,850,000,000 |  | 850,000,000 |  |  |  |  |
Shares authorized, par value (usd per share) | $ / shares |  |  | $ 0.001 |  | $ 0.001 |  |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  | 8,000,000 |  |  |  |  | 36,012,000 |  |  |
Convertible perpetual preferred stock dividends, common stock issued (in shares) |  |  |  |  |  |  | 24,289,000 |  |  |
Common Stock | Senior Notes |  |  |  |  |  |  |  |  |  |
Equity Disclosure |  |  |  |  |  |  |  |  |  |
Common stock issued for debt exchange (in shares) |  |  |  |  |  |  | 28,000,000 |  |  |

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