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7. Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2011
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 are as follows (in thousands):
| Three Months Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Basic weighted average shares outstanding | 28,014 |  |  | 27,606 |  |  | 27,959 |  |  | 27,575 |
Effect of potentially dilutive stock options and restricted stock awards | 481 |  |  | 519 |  |  | 484 |  |  | 522 |
Diluted weighted average common shares | 28,495 |  |  | 28,125 |  |  | 28,443 |  |  | 28,097 |
Anti-dilutive shares | — |  |  | 96 |  |  | 37 |  |  | 96 |

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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 -Topic 260 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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