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Earnings Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block] |
|  |  |  | Three months ended |  |  | Nine months ended
|  |  | September 30, |  | September 30,
|  |  |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011
Earnings: |  |  |  |  |  |  |  |  |  |  |
| Net income (numerator for basic and diluted calculations) | $ | 144,475 |  | $ | 134,602 |  | $ | 408,904 |  | $ | 407,466
Shares: |  |  |  |  |  |  |  |  |  |  |
| Weighted average outstanding shares (denominator for |  |  |  |  |  |  |  |  |  |  |
|  | basic calculation) |  | 73,776 |  |  | 73,856 |  |  | 73,690 |  |  | 73,680
| Equivalent shares from outstanding stock options(1) |  | 362 |  |  | 398 |  |  | 388 |  |  | 527
| Denominator for diluted calculation |  | 74,138 |  |  | 74,254 |  |  | 74,078 |  |  | 74,207
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
| Basic | $ | 1.96 |  | $ | 1.82 |  | $ | 5.55 |  | $ | 5.53
| Diluted | $ | 1.95 |  | $ | 1.81 |  | $ | 5.52 |  | $ | 5.49
| (1) Year-to-date amounts are the weighted average of the individual quarterly amounts.

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