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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Share |
| Year ended December 31
| 2013 |  | 2012 |  | 2011
Net income | $ | 327,438 |  | $ | 278,000 |  | $ | 214,945
Shares: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  | 30,957 |  |  | 31,513 |  |  | 31,217
Dilutive stock awards |  | 324 |  |  | 270 |  |  | 558
Diluted weighted average number of common shares outstanding |  | 31,281 |  |  | 31,783 |  |  | 31,775
Basic earnings per share | $ | 10.58 |  | $ | 8.82 |  | $ | 6.89
Diluted earnings per share | $ | 10.47 |  | $ | 8.75 |  | $ | 6.76

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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