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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Basic and Diluted Weighted Average Shares Outstanding | A reconciliation of basic and diluted weighted average shares outstanding is as follows:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
|  | (Amounts in thousands, except per share data) |
Net income |  | $ | 33,498 |  |  | $ | 14,552 |  |  | $ | 99,181 |  |  | $ | 40,228 |
Weighted average shares used in computing net income per share - basic |  |  | 55,015 |  |  |  | 52,545 |  |  |  | 54,918 |  |  |  | 52,341 |
Effect of dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |
Options and stock units |  |  | 919 |  |  |  | 916 |  |  |  | 913 |  |  |  | 951 |
Convertible senior notes |  |  | 1,373 |  |  |  | 8 |  |  |  | 1,180 |  |  |  | 8 |
Dilutive effect of unvested performance stock units |  |  | 61 |  |  |  | — |  |  |  | 61 |  |  |  | — |
Dilutive potential common shares |  |  | 2,353 |  |  |  | 924 |  |  |  | 2,154 |  |  |  | 959 |
Weighted average shares used in computing net income per share - diluted |  |  | 57,368 |  |  |  | 53,469 |  |  |  | 57,072 |  |  |  | 53,300 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.61 |  |  | $ | 0.28 |  |  | $ | 1.81 |  |  | $ | 0.77 |
Diluted |  | $ | 0.58 |  |  | $ | 0.27 |  |  | $ | 1.74 |  |  | $ | 0.75 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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=124432515&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
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