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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, |  |  | Nine Months Ended September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 93,277 |  |  | $ | 75,994 |  |  | $ | 321,260 |  |  | $ | 261,494 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares used in net income per common share – basic |  |  | 54,476,000 |  |  |  | 54,282,000 |  |  |  | 54,539,000 |  |  |  | 54,076,000 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, stock appreciation rights and shares issued under employee stock purchase plan |  |  | 478,000 |  |  |  | 819,000 |  |  |  | 632,000 |  |  |  | 944,000 |
Shares used in net income per common share – diluted |  |  | 54,954,000 |  |  |  | 55,101,000 |  |  |  | 55,171,000 |  |  |  | 55,020,000 |
Net income per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.71 |  |  | $ | 1.40 |  |  | $ | 5.89 |  |  | $ | 4.84 |
Diluted |  | $ | 1.70 |  |  | $ | 1.38 |  |  | $ | 5.82 |  |  | $ | 4.75 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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