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Weighted Average Shares (Tables) | 12 Months Ended
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Dec. 31, 2012
Calculation of Weighted Average Shares | Weighted-average shares were calculated as follows (in thousands):
|  | Year Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Basic weighted-average common shares outstanding |  |  | 42,833 |  |  |  | 41,859 |  |  |  | 39,924 |
Effect of dilutive stock options |  |  | 807 |  |  |  | 903 |  |  |  | 373 |
Diluted weighted-average common and common-equivalent shares outstanding |  |  | 43,640 |  |  |  | 42,762 |  |  |  | 40,297 |

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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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