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Net (Loss) Income Per Common Share- Calculation of Basic Net (Loss) Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Mar. 31, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Numerator for basic and diluted net (loss) income per share: |  |  |  |  |  |
Net (loss) income | $ (73,483) | $ 17,322 |  | $ (67,982) | $ 13,942 | $ 3,070
Preferred deemed dividend |  |  | $ (9,455) |  | (9,455) |
Series B preferred stock dividends | (4,500) |  |  | (8,748) |  |
Net (loss) income attributable to common shareholders | $ (77,983) | $ 17,322 |  | $ (76,730) | $ 4,487 |
Denominator for basic net (loss) income per share: |  |  |  |  |  |
Weighted-average shares outstanding | 204,368,982 | 202,164,035 |  | 203,361,710 | 202,071,761 |
Weighted-average unvested restricted shares outstanding | (2,481,891) | (1,164,554) |  | (1,842,836) | (1,333,534) |
Denominator for basic net (loss) income per share: | 201,887,091 | 200,999,481 |  | 201,518,874 | 200,738,227 |
Basic net (loss) income per share attributable to common shareholders | $ (0.39) | $ 0.09 |  | $ (0.38) | $ 0.02 |

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