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7. Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Schedule of weighted-average common shares outstanding used to calculate basic and diluted earnings per shares and the anti-dilutive shares | The weighted average number of common shares outstanding used to calculate basic and diluted earnings per share, and the anti-dilutive shares that are excluded from the diluted earnings per share calculation are as follows (in thousands):
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Basic weighted average shares outstanding | 29,863 |  |  | 29,660 |  |  | 29,822 |  |  | 29,618 |
Effect of potentially dilutive stock options and restricted stock awards | 429 |  |  | 392 |  |  | 412 |  |  | 376 |
Diluted weighted average common shares | 30,292 |  |  | 30,052 |  |  | 30,234 |  |  | 29,994 |
Anti-dilutive shares | 64 |  |  | 12 |  |  | 35 |  |  | 22 |

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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 http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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