The following table sets forth the computation of basic and diluted net income per share:
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Three months ended |
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March 31,
2013 |
|
March 31,
2012 |
Numerator: |
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Numerator for basic and diluted income per share - net income |
|
$ |
10,855 |
|
|
$ |
10,273 |
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Denominator (in thousands): |
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Denominator for basic income per share - weighted-average shares |
|
29,511 |
|
|
28,692 |
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Effect of dilutive stock options (in thousands) |
|
606 |
|
|
593 |
|
Effect of dilutive performance shares (in thousands) |
|
53 |
|
|
37 |
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Effect of dilutive non-vested shares and deferred stock units (in thousands) |
|
94 |
|
|
41 |
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Denominator for diluted income per share - adjusted weighted-average shares |
|
30,264 |
|
|
29,363 |
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Basic net income per share |
|
$ |
0.37 |
|
|
$ |
0.36 |
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Diluted net income per share |
|
$ |
0.36 |
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|
$ |
0.35 |
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The number of instruments that could potentially dilute net income per basic share in the future, but that were not included in the computation of net income per diluted share because to do so would have been anti-dilutive for the periods presented, are as follows:
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Three months ended |
|
March 31,
2013 |
|
March 31,
2012 |
Anti-dilutive stock options (in thousands) |
$ |
150 |
|
|
$ |
189 |
|
Anti-dilutive performance shares (in thousands) |
16 |
|
|
14 |
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Anti-dilutive non-vested shares and deferred stock units (in thousands) |
— |
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|
61 |
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Total anti-dilutive shares (in thousands) |
$ |
166 |
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|
$ |
264 |
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