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Earnings per Share | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings per share | Earnings per Share Basic earnings per share are computed using the weighted average number of shares outstanding and diluted earnings per share are computed using the weighted average number of shares and dilutive share equivalents (consisting of non-qualified stock options, restricted stock units and employee stock purchase plan contributions) outstanding during the periods using the treasury stock method. The following is a reconciliation of the shares used to compute basic and diluted earnings per share (in thousands):
|  | Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
Weighted average number of common shares outstanding used to compute basic earnings per share |  | 52,503 |  |  | 53,192 |  |  | 52,259 |
Dilutive effect of stock-based awards |  | 702 |  |  | 555 |  |  | 746 |
Number of shares used to compute diluted earnings per share |  | 53,205 |  |  | 53,747 |  |  | 53,005 |
There were no significant share equivalents outstanding as of December 31, 2017, 2016 and 2015 that were anti-dilutive when applying the treasury stock method.

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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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