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Net Income (Loss) Per Common Share - Calculation of Diluted Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Numerator for diluted net income (loss) per share: |  |  |  |  |
Net income (loss) | $ 38,411 | $ (16,645) | $ 34,876 | $ 61,314 | $ 201,700
Less: Series B preferred stock dividends | (4,500) | (4,500) | (13,500) | (13,500) |
Less: undistributed earnings attributed to participating securities (diluted calculation) | (21,541) |  | (13,581) | (26,241) |
Diluted net income (loss) attributable to common stockholders | $ 12,370 | $ (21,145) | $ 7,795 | $ 21,573 |
Denominator for diluted net income (loss) per share: |  |  |  |  |
Weighted-average shares outstanding | 206,714,132 | 206,380,800 | 206,529,762 | 206,261,993 |
Weighted-average unvested restricted shares outstanding | (4,053,640) | (4,039,591) | (3,956,447) | (4,014,718) |
Effect of dilutive potential shares | 10,065,629 |  | 10,065,629 | 35,327,739 |
Denominator for diluted net income (loss) per share | 212,726,121 | 202,341,209 | 212,638,944 | 237,575,014 |
Diluted net income (loss) per share attributable to common stockholders | $ 0.06 | $ (0.10) | $ 0.04 | $ 0.09 |

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