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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
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 and nine months ended September 30, 2018 and 2017 (in thousands, except per share data).
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 13,595 |  |  | $ | 9,864 |  |  | $ | 62,526 |  |  | $ | 46,306 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 54,794 |  |  |  | 54,142 |  |  |  | 54,489 |  |  |  | 53,804 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options (1) |  |  | 1,654 |  |  |  | 1,433 |  |  |  | 1,573 |  |  |  | 1,499 |
Restricted stock awards (1) |  |  | 268 |  |  |  | 244 |  |  |  | 307 |  |  |  | 330 |
Contingent shares (2) |  |  | 24 |  |  |  | 8 |  |  |  | 24 |  |  |  | 8 |
Diluted weighted average common shares outstanding |  |  | 56,740 |  |  |  | 55,827 |  |  |  | 56,393 |  |  |  | 55,641 |
Basic earnings per share from continuing operations |  | $ | 0.25 |  |  | $ | 0.18 |  |  | $ | 1.15 |  |  | $ | 0.86 |
Diluted earnings per share from continuing operations |  | $ | 0.24 |  |  | $ | 0.18 |  |  | $ | 1.11 |  |  | $ | 0.83 |
| (1) | A total of 0.5 million and 0.3 million share based awards were excluded from the calculation of diluted earnings per share for the three and nine months ended September 30, 2018, respectively, and a total of 0.8 million and 0.4 million share based awards were excluded from the calculation of diluted earnings per share for the three and nine months ended September 30, 2017, 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 14, Acquisitions, for further details.

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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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