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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Computation of Basic and Diluted Earnings Per Share from Continuing Operations | The following table sets forth the reconciliation of the numerator and the denominator of basic earnings per share and diluted earnings per share from continuing operations for the years ended December 31, 2017, 2016 and 2015 (in thousands, except per share data):
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  | $ | 51,032 |  |  | $ | 40,607 |  |  | $ | 35,003 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  | 53,862 |  |  |  | 52,321 |  |  |  | 50,280 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |
Stock options (1) |  |  | 1,499 |  |  |  | 870 |  |  |  | 876 |
Restricted stock awards |  |  | 328 |  |  |  | 261 |  |  |  | 277 |
Contingent shares (2) |  |  | - |  |  |  | 61 |  |  |  | 29 |
Convertible senior subordinated notes (3) |  |  | — |  |  |  | — |  |  |  | 1,231 |
Diluted weighted average common shares outstanding |  |  | 55,689 |  |  |  | 53,513 |  |  |  | 52,693 |
Earnings Per Share: |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share from continuing operations |  | $ | 0.95 |  |  | $ | 0.78 |  |  | $ | 0.70 |
Diluted earnings per share from continuing operations |  | $ | 0.92 |  |  | $ | 0.76 |  |  | $ | 0.66 |
(1) | For the years ended December 31, 2017, 2016 and 2015, a total of 0.5 million, 0.8 million and 1.5 million stock based awards, respectively, were excluded from the calculation of diluted earnings per share as their exercise prices would render them 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 conditions have been met. For further details, refer to Note 18, Acquisitions.
(3) | The 2010 Notes were retired on October 1, 2015 with the amounts available under the credit facility. The dilutive impact of potential shares to be issued related to the 2010 Notes was based on the average share price of $9.62 in 2015, which exceeded the conversion price of $7.41.

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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/2003/role/presentationRef -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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