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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share from Continuing Operations | The following table sets forth the computation of basic and diluted earnings per share from continuing operations for the three months ended March 31, 2021 and 2020 (in thousands, except per share data).
| Three Months Ended March 31, |  |  |
| 2021 |  | 2020 |  |  |  |  |
Numerator: |  |  |  |  |  |  |  |
Income from continuing operations | $ | 50,216 |  |  | $ | 36,862 |  |  |  |  |  |
Denominator: |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Weighted average common shares outstanding | 53,366 |  |  | 54,571 |  |  |  |  |  |
Diluted |  |  |  |  |  |  |  |
Stock options (1) | 776 |  |  | 993 |  |  |  |  |  |
Restricted stock awards (1) | 257 |  |  | 296 |  |  |  |  |  |
Contingent shares (2) | 37 |  |  | 85 |  |  |  |  |  |
Diluted weighted average common shares outstanding (3) | 54,436 |  |  | 55,945 |  |  |  |  |  |
Basic earnings per share from continuing operations | $ | 0.94 |  |  | $ | 0.68 |  |  |  |  |  |
Diluted earnings per share from continuing operations | $ | 0.92 |  |  | $ | 0.66 |  |  |  |  |  |
(1)A total of 1 thousand and 33 thousand stock-based awards were excluded from the calculation of diluted earnings per share for the three months ended March 31, 2021 and 2020. respectively, as their effect would be anti-dilutive. (2)Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by us once future considerations have been met. Refer to Note 11. Business Combinations, for further details. (3)The denominator used in calculating diluted earnings per share did not include 447 thousand and 332 thousand performance share units for the three months ended March 31, 2021 and 2020, respectively. The performance conditions associated with these performance share units were not met and consequently none of these performance share units were considered as issuable for the three months ended March 31, 2021 and 2020.

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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=6371337&loc=d3e3550-109257 + Details
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