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9. Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2013
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
|  | March 31,
|  | 2013 |  | 2012
Basic weighted average shares outstanding |  | 28,494 |  |  | 28,201 |
Effect of potentially dilutive stock options and restricted stock awards |  | 323 |  |  | 352 |
Diluted weighted average common shares |  | 28,817 |  |  | 28,553 |
Anti-dilutive shares |  | 92 |  |  | 112 |

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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://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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