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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Weighted Average Number of Common Shares Outstanding | The table below reflects the calculation of the weighted average number of common shares outstanding, on an as if converted basis, used in computing basic and diluted earnings per common share.
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Basic common shares outstanding |  |  | 44,332 |  |  |  | 44,631 |  |  |  | 45,722 |
Effect of dilutive stock options and restricted stock |  |  | 919 |  |  |  | 474 |  |  |  | 674 |
Diluted common shares outstanding |  |  | 45,251 |  |  |  | 45,105 |  |  |  | 46,396 |

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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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