Net Income per Common Share The following table sets forth the calculation of basic and diluted net income per share for the three months ended March 31, 2015 and 2014 (in thousands, except per share amounts): | | | | | | | | | | Three Months Ended
March 31, | | 2015 | | 2014 | Net income | $ | 21,557 |
| | $ | 24,853 |
| Weighted-average shares of common stock used to compute basic net income per share (excluding unvested restricted stock) | 105,928 |
| | 109,164 |
| Effect of dilutive common stock equivalents: | | | | Dilutive effect of unvested restricted stock units | 928 |
| | 654 |
| Dilutive effect of employee stock options | 568 |
| | 2,117 |
| Shares used in computing diluted net income per common share | 107,424 |
| | 111,935 |
| Basic net income per common share | $ | 0.20 |
| | $ | 0.23 |
| Diluted net income per common share | $ | 0.20 |
| | $ | 0.22 |
| Weighted average stock options and restricted stock units excluded from calculation due to anti-dilutive effect | 3,898 |
| | 4,653 |
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