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Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31, |
|  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 105,121 |  |  | $ | 65,060 |
Denominator: |  |  |  |  |  |  |  |
Shares used in net income per common share — basic |  |  | 54,423,000 |  |  |  | 53,769,000 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan |  |  | 863,000 |  |  |  | 1,189,000 |
Shares used in net income per common share — diluted |  |  | 55,286,000 |  |  |  | 54,958,000 |
Net income per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 1.93 |  |  | $ | 1.21 |
Diluted |  | $ | 1.90 |  |  | $ | 1.18 |

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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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