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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Computations Of Basic And Diluted Earnings Per Share |
| Year ended December 31
| 2012 |  | 2011 |  | 2010
Net income | $ | 278,000 |  | $ | 214,945 |  | $ | 178,981
Shares: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  | 31,513 |  |  | 31,217 |  |  | 31,234
Dilutive stock options and SOSARs |  | 254 |  |  | 497 |  |  | 422
Dilutive non-vested stock awards |  | 16 |  |  | 61 |  |  | 79
Diluted weighted average number of common shares outstanding |  | 31,783 |  |  | 31,775 |  |  | 31,735
Basic earnings per share | $ | 8.82 |  | $ | 6.89 |  | $ | 5.73
Diluted earnings per share | $ | 8.75 |  | $ | 6.76 |  | $ | 5.64

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- Definition Tabular disclosure of the numerators and the denominators of the basic and diluted per-share (or per-unit) computations for income from continuing operations, including the effect that has been given to preferred dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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