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Net Income Per Share | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Net Income Per Share | Net Income Per Share The following table sets forth the computation of basic and diluted net income per share:
|  | Three months ended |  | Nine months ended
|  | September 30, 2014 |  | September 30, 2013 |  | September 30, 2014 |  | September 30, 2013
Numerator: |  |  |  |  |  |  |  |
Numerator for basic and diluted income per share - net income |  | $ | 16,744 |  |  | $ | 14,197 |  |  | $ | 44,123 |  |  | $ | 38,882 |
Denominator (in thousands): |  |  |  |  |  |  |  |  |  |
Denominator for basic income per share - weighted-average shares |  | 30,415 |  |  | 30,374 |  |  | 30,710 |  |  | 30,017 |
Effect of dilutive stock options (in thousands) |  | 418 |  |  | 447 |  |  | 431 |  |  | 512 |
Effect of dilutive performance shares (in thousands) |  | 37 |  |  | 13 |  |  | 41 |  |  | 9 |
Effect of dilutive non-vested shares and deferred stock units (in thousands) |  | 62 |  |  | 152 |  |  | 52 |  |  | 139 |
Denominator for diluted income per share - adjusted weighted-average shares |  | 30,932 |  |  | 30,986 |  |  | 31,234 |  |  | 30,677 |
Basic net income per share |  | $ | 0.55 |  |  | $ | 0.47 |  |  | $ | 1.44 |  |  | $ | 1.30 |
Diluted net income per share |  | $ | 0.54 |  |  | $ | 0.46 |  |  | $ | 1.41 |  |  | $ | 1.27 |
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:
| September 30, 2014 |  | September 30, 2013
Anti-dilutive stock options (in thousands) | 108 |  |  | 186 |
Anti-dilutive performance shares (in thousands) | — |  |  | — |
Total anti-dilutive shares (in thousands) | 108 |  |  | 186 |

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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 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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