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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Net Income Per Share | The following table sets forth the computation of basic and diluted net income per share:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 7,320 |  |  | $ | 18,572 |  |  | $ | 13,081 |  |  | $ | 41,340 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 53,054,000 |  |  |  | 52,679,000 |  |  |  | 52,914,000 |  |  |  | 52,591,000 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options, restricted stock and employee stock purchase plan |  |  | 304,000 |  |  |  | 527,000 |  |  |  | 445,000 |  |  |  | 623,000 |
Shares used in net income per common share – diluted |  |  | 53,358,000 |  |  |  | 53,206,000 |  |  |  | 53,359,000 |  |  |  | 53,214,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.14 |  |  | $ | 0.35 |  |  | $ | 0.25 |  |  | $ | 0.79 |
Diluted |  | $ | 0.14 |  |  | $ | 0.35 |  |  | $ | 0.25 |  |  | $ | 0.78 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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