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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Computation of earnings per share and reconciliation of basic and diluted weighted average common shares outstanding | The table below presents the computation of EPS, including the reconciliation of basic and diluted weighted average shares outstanding (in thousands, except EPS):
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Net income |  | $ | 131,390 |  |  | $ | 117,049 |  |  | $ | 164,027 |  |  | $ | 148,388 |
Weighted average shares outstanding: |  |  |  |  |  |  |  |
Basic |  | 39,827 |  |  | 40,453 |  |  | 39,654 |  |  | 40,413 |
Effect of dilutive securities: |  |  |  |  |  |  |  |
Stock options and employee stock purchase plan |  | 1,021 |  |  | 1,361 |  |  | 1,119 |  |  | 1,427 |
Diluted |  | 40,848 |  |  | 41,814 |  |  | 40,773 |  |  | 41,840 |
Earnings per share: |  |  |  |  |  |  |  |
Basic |  | $ | 3.30 |  |  | $ | 2.89 |  |  | $ | 4.14 |  |  | $ | 3.67 |
Diluted |  | $ | 3.22 |  |  | $ | 2.80 |  |  | $ | 4.02 |  |  | $ | 3.55 |
Anti-dilutive stock options excluded from diluted earnings per share computations |  | 50 |  |  | — |  |  | 50 |  |  | — |

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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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