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Net Income (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Schedule of Basic and Diluted Net Income Per Share | Reconciliation of the shares used in the basic and diluted earnings per share computations for the three and six months ended June 30, 2018 and June 30, 2017 are as follows (in thousands):
|  | Three Months Ended June 30, |  | Six Months Ended June 30,
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Basic weighted average shares outstanding |  | 48,487 |  |  | 48,140 |  |  | 48,406 |  |  | 48,104 |
Add effects of share-based compensation instruments (1) |  | 851 |  |  | 163 |  |  | 857 |  |  | 137 |
Diluted weighted average shares outstanding |  | 49,338 |  |  | 48,303 |  |  | 49,263 |  |  | 48,241 |
(1) | Excluded from the computation of diluted earnings per share were stock options, SARs and restricted share units totaling 0.7 million and 1.8 million shares as of June 30, 2018 and June 30, 2017, respectively, because to include them would be anti-dilutive.

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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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