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Net Income Per Share (Tables) | 6 Months Ended
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Jun. 30, 2019
Earnings Per Share [Abstract] |
Calculation of Net Income Per Share | The calculation of net income per share for the three and six months ended June 30, 2019 and 2018, is reflected in the following table (in thousands, except per share amounts):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Net income | $ | 114,612 |  |  | $ | 109,315 |  |  | $ | 224,410 |  |  | $ | 205,482 |
Basic: |  |  |  |  |  |  |
Weighted average shares | 116,381 |  |  | 121,307 |  |  | 116,722 |  |  | 121,619 |
Diluted: |  |  |  |  |  |  |
Weighted average shares | 116,381 |  |  | 121,307 |  |  | 116,722 |  |  | 121,619 |
Dilutive effect of potential common shares | 607 |  |  | 961 |  |  | 753 |  |  | 957 |
Diluted weighted average shares | 116,988 |  |  | 122,268 |  |  | 117,475 |  |  | 122,576 |
Net income per share: |  |  |  |  |  |  |
Basic | $ | .98 |  |  | $ | .90 |  |  | $ | 1.92 |  |  | $ | 1.69 |
Diluted | $ | .98 |  |  | $ | .89 |  |  | $ | 1.91 |  |  | $ | 1.68 |

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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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