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Earnings Per Share | 6 Months Ended
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Jun. 30, 2018
Net income per share |
Earnings Per Share | Note 5. Earnings Per Share Basic net income per share has been computed using the weighted-average number of shares of common stock outstanding during the period. Diluted net income per share has been computed using the weighted-average number of shares of common stock and dilutive potential common shares from stock options and restricted stock units outstanding during the period. The following table sets forth the computation of the basic and diluted net income per share for the periods indicated (in thousands, except per share amounts):
|  | Three months ended June 30, |  | Six months ended June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 8,034 |  | $ | 29,071 |  | $ | 10,154 |  | $ | 48,860 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares used to compute net income per share |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 19,590 |  |  | 19,081 |  |  | 19,541 |  |  | 18,841 |
Effect of dilutive options and restricted stock units |  |  | 490 |  |  | 1,286 |  |  | 471 |  |  | 1,115 |
Diluted |  |  | 20,080 |  |  | 20,367 |  |  | 20,012 |  |  | 19,956 |
Net income per share |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.41 |  | $ | 1.52 |  | $ | 0.52 |  | $ | 2.59 |
Diluted |  | $ | 0.40 |  | $ | 1.43 |  | $ | 0.51 |  | $ | 2.45 |
There were no securities that were excluded from the computation of diluted net income per share.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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