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Net Income Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2013
Earnings Per Share [Abstract] |
Summary of Basic and Diluted Weighted Average Common Shares | Basic and diluted weighted average common shares are as follows (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Basic weighted average common shares outstanding |  |  | 21,256 |  |  |  | 22,583 |  |  |  | 21,781 |  |  |  | 22,660 |
Weighted average common equivalent shares |  |  | 491 |  |  |  | 440 |  |  |  | 421 |  |  |  | 438 |
Diluted weighted average common shares outstanding |  |  | 21,747 |  |  |  | 23,023 |  |  |  | 22,202 |  |  |  | 23,098 |
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive |  |  | 295 |  |  |  | 559 |  |  |  | 746 |  |  |  | 483 |

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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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