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Income (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Reconciliation of Weighted Average Shares Used in Computation of Income (Loss) Per Share | The following table is a reconciliation of the weighted average shares used in the computation of income (loss) per share for the periods presented (in thousands, except per share data):
|  | Three Months Ended September 30, |
|  | 2018 |  |  | 2017 |
|  |  |  |  | Weighted |  |  |  |  |  |  |  |  | Weighted |  |  |  |
|  | Income |  |  | Average |  |  | Per- |  |  | Income |  |  | Average |  |  | Per- |
|  | (Loss) |  |  | Shares |  |  | Share |  |  | (Loss) |  |  | Shares |  |  | Share |
Income (loss) per share — basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders |  | $ | 15,682 |  |  |  | 23,106 |  |  | $ | 0.68 |  |  | $ | (17,614 | ) |  |  | 22,772 |  |  | $ | (0.77 | )
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes |  |  | 1,487 |  |  |  | 21,426 |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Unvested performance stock grants |  |  | — |  |  |  | 832 |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Unvested restricted stock grants |  |  | — |  |  |  | 322 |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Income (loss) per share — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders plus assumed exercises and conversion |  | $ | 17,169 |  |  |  | 45,686 |  |  | $ | 0.38 |  |  | $ | (17,614 | ) |  |  | 22,772 |  |  | $ | (0.77 | )
|  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |
|  |  |  |  | Weighted |  |  |  |  |  |  |  |  | Weighted |  |  |  |
|  | Income |  |  | Average |  |  | Per- |  |  | Income |  |  | Average |  |  | Per- |
|  | (Loss) |  |  | Shares |  |  | Share |  |  | (Loss) |  |  | Shares |  |  | Share |
Income (loss) per share — basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders |  | $ | (39,121 | ) |  |  | 23,104 |  |  | $ | (1.69 | ) |  | $ | (52,672 | ) |  |  | 20,848 |  |  | $ | (2.53 | )
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Unvested performance stock grants |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Unvested restricted stock grants |  |  | — |  |  |  | — |  |  |  |  |  |  |  | — |  |  |  | — |  |  |  |  |
Income (loss) per share — diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) available to common stockholders plus assumed exercises and conversion |  | $ | (39,121 | ) |  |  | 23,104 |  |  | $ | (1.69 | ) |  | $ | (52,672 | ) |  |  | 20,848 |  |  | $ | (2.53 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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