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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2019
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, 2019 and 2018 (in thousands, except per share data).
|  | Three Months Ended |
|  | March 31, |
|  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 37,565 |  |  | $ | 35,810 |
Denominator: |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 54,287 |  |  |  | 54,071 |
Diluted |  |  |  |  |  |  |  |
Stock options (1) |  |  | 1,311 |  |  |  | 1,449 |
Restricted stock awards (1) |  |  | 274 |  |  |  | 367 |
Contingent shares (2) |  |  | 43 |  |  |  | 37 |
Diluted weighted average common shares outstanding (3) |  |  | 55,915 |  |  |  | 55,924 |
Basic earnings per share from continuing operations |  | $ | 0.69 |  |  | $ | 0.66 |
Diluted earnings per share from continuing operations |  | $ | 0.67 |  |  | $ | 0.64 |
| (1) | 0.6 million share based awards were excluded from the calculation of diluted earnings per share for the three months ended March 31, 2019 as their effect would be anti-dilutive whereas 0.5 million share based awards were excluded from the calculation of diluted earnings per share for the three months ended March 31, 2018.
| (2) | Contingent shares represent additional shares to be issued for purchase price earned by former owners of businesses acquired by us once future conditions have been met. Refer to Note 14, Acquisitions, for further details.
| (3) | The denominator used in calculated diluted earnings per share did not include approximately 173 thousand restricted performance shares, as the performance targets for these awards had not yet been met.

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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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