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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2022
Basic and Diluted Weighted Average Shares Outstanding | A reconciliation of basic and diluted weighted average shares outstanding is as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
|  | (Amounts in thousands, except per share data) |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 49,861 |  |  | $ | 36,233 |  |  | $ | 96,825 |  |  | $ | 65,683 |
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |  |
Charges associated with convertible debt instruments, net of tax |  |  | — |  |  |  | — |  |  |  | 387 |  |  |  | — |
Numerator for diluted earnings per share - net income available to common stockholders after the effect of dilutive securities |  | $ | 49,861 |  |  | $ | 36,233 |  |  | $ | 97,212 |  |  | $ | 65,683 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average shares used in computing net income per share - basic |  |  | 55,444 |  |  |  | 54,931 |  |  |  | 55,399 |  |  |  | 54,868 |
Effect of dilutive shares: |  |  |  |  |  |  |  |  |  |  |  |
Options and stock units |  |  | 598 |  |  |  | 843 |  |  |  | 661 |  |  |  | 903 |
Convertible Senior Notes |  |  | 676 |  |  |  | 1,012 |  |  |  | 1,779 |  |  |  | 1,052 |
Dilutive effect of unvested performance stock units |  |  | 3 |  |  |  | — |  |  |  | 3 |  |  |  | — |
Dilutive potential common shares |  |  | 1,277 |  |  |  | 1,855 |  |  |  | 2,443 |  |  |  | 1,956 |
Denominator for diluted earnings per share - adjusted weighted average shares used in computing net income per share - diluted |  |  | 56,721 |  |  |  | 56,786 |  |  |  | 57,842 |  |  |  | 56,824 |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.90 |  |  | $ | 0.66 |  |  | $ | 1.75 |  |  | $ | 1.20 |
Diluted |  | $ | 0.88 |  |  | $ | 0.64 |  |  | $ | 1.68 |  |  | $ | 1.16 |

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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 https://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration