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Computation of Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Schedule of basic and diluted (loss) earnings per share calculations | The table below sets forth the calculation of basic and diluted income per share for the periods indicated (in thousands, except per share data).
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net income used for calculating basic and diluted income per share | $ | 148,865 |  |  | $ | 16,964 |  |  | $ | 584,201 |  |  | $ | 147,138 |
Denominator: |  |  |  |  |  |  |
Weighted average common shares used in the calculation of basic income per share | 83,566 |  |  | 89,378 |  |  | 85,877 |  | 89,307
Dilutive effect of outstanding awards associated with stock-based compensation plans (1) | 1,200 |  |  | 577 |  |  | 1,048 |  | 695
Shares used in the calculation of diluted income per share | 84,766 |  |  | 89,955 |  |  | 86,925 |  | 90,002
Basic income per share | $ | 1.78 |  |  | $ | 0.19 |  |  | $ | 6.80 |  |  | $ | 1.65 |
Diluted income per share | $ | 1.76 |  |  | $ | 0.19 |  |  | $ | 6.72 |  |  | $ | 1.63 |
(1)Certain potential shares of common stock were not included in the computation of diluted income per share because the effect would have been anti-dilutive. For the three and nine months ended September 30, 2020, approximately 0.5 million and 0.8 million shares of common stock equivalents, respectively, were excluded from the calculation of diluted income per share because they were anti-dilutive. For both of the three and nine months ended September 30, 2021, the number of anti-dilutive shares was de minimis.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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