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7. Earnings Per Share (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30, |  | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Basic weighted average shares outstanding | 29,814 |  |  | 29,613 |  |  | 29,801 |  |  | 29,597 |
Effect of potentially dilutive stock options and restricted stock awards | 405 |  |  | 393 |  |  | 396 |  |  | 365 |
Diluted weighted average common shares | 30,219 |  |  | 30,006 |  |  | 30,197 |  |  | 29,962 |
Anti-dilutive shares | 13 |  |  | — |  |  | 13 |  |  | 15 |

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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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