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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
Earnings Per Share [Abstract] |
Earnings Per Share |
|  | Years ended December 31
|  | 2014 |  | 2013 |  | 2012
Net income |  | $ | 445,374 |  | $ | 327,438 |  | $ | 278,000
Shares: |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 31,038 |  |  | 30,957 |  |  | 31,513
Dilutive stock awards |  |  | 474 |  |  | 324 |  |  | 270
Diluted weighted average number of common shares outstanding |  |  | 31,512 |  |  | 31,281 |  |  | 31,783
Basic earnings per share |  | $ | 14.35 |  | $ | 10.58 |  | $ | 8.82
Diluted earnings per share |  | $ | 14.13 |  | $ | 10.47 |  | $ | 8.75

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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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