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Earnings per share | 12 Months Ended
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Dec. 31, 2015
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 incentive stock options, 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,
|  | 2015 |  | 2014 |  | 2013
Weighted average number of common shares outstanding used to compute basic earnings per share |  | 52,259 |  |  | 53,437 |  |  | 53,481 |
Dilutive effect of stock-based awards |  | 746 |  |  | 857 |  |  | 1,074 |
Number of shares used to compute diluted earnings per share |  | 53,005 |  |  | 54,294 |  |  | 54,555 |
There were no significant share equivalents outstanding as of December 31, 2015, 2014 and 2013 that were anti-dilutive when applying the treasury stock method.

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