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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Table Text Block] |
| 2012 |  | 2011 |  | 2010
Earnings: |  |  |  |  |  |  |  |
| Net income (numerator for basic and diluted calculations) | $ | 631,893 |  | $ | 546,045 |  | $ | 535,742
Shares: |  |  |  |  |  |  |  |
| Weighted average outstanding shares (denominator for basic calculations) |  |  |  |  |  |  |  |
|  |  | 73,737 |  |  | 73,586 |  |  | 73,157
Equivalent shares from outstanding stock options and warrants |  | 416 |  |  | 522 |  |  | 1,537
|  | Diluted shares (denominator for diluted calculations) |  | 74,153 |  |  | 74,108 |  |  | 74,694
Earnings per share: |  |  |  |  |  |  |  |
| Basic | $ | 8.57 |  | $ | 7.42 |  | $ | 7.32
| Diluted | $ | 8.52 |  | $ | 7.37 |  | $ | 7.17

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- Definition This element may be used to capture the complete disclosure pertaining to an entity's basic and diluted earnings per share. + References No definition available. + Details
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- Details
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