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Net Income (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2017
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Net Income Per Share | The following table sets forth the computation of basic and diluted net income (loss) per share, (in thousands, except per share data):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Numerator: |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 27,830 |  |  | $ | (1,569 | ) |  | $ | 86,599 |  |  | $ | (32,990 | )
Denominator: |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  | 48,181 |  |  | 49,075 |  |  | 48,130 |  |  | 49,016 |
Add effects of share-based compensation instruments (1) |  | 353 |  |  | — |  |  | 209 |  |  | — |
Diluted weighted average shares outstanding |  | 48,534 |  |  | 49,075 |  |  | 48,339 |  |  | 49,016 |
Basic income (loss) per share |  | $ | 0.58 |  |  | $ | (0.03 | ) |  | $ | 1.80 |  |  | $ | (0.67 | )
Diluted income (loss) per share |  | $ | 0.57 |  |  | $ | (0.03 | ) |  | $ | 1.79 |  |  | $ | (0.67 | )
(1) | Excluded from the computation of diluted earnings per share for the three and nine months ended September 30, 2017 were 1.6 million stock options and SARs outstanding as of September 30, 2017, because to include them would have been anti-dilutive. Excluded from the computation of diluted earnings per share for the three and nine months ended September 30, 2016 were approximately 2.3 million stock options, SARs and restricted share units outstanding as of September 30, 2016, because to include them would have been anti-dilutive due to the net losses.

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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://www.xbrl.org/2003/role/presentationRef -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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