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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2012
Earnings Per Share [Abstract] |
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block] |
|  |  |  | Three months ended |  |  | Six months ended
|  |  | June 30, |  | June 30,
|  |  |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011
Earnings: |  |  |  |  |  |  |  |  |  |  |
| Net income (numerator for basic and diluted calculations) | $ | 141,111 |  | $ | 123,944 |  | $ | 264,429 |  | $ | 272,864
Shares: |  |  |  |  |  |  |  |  |  |  |
| Weighted average outstanding shares (denominator for |  |  |  |  |  |  |  |  |  |  |
|  | basic calculation) |  | 73,718 |  |  | 73,971 |  |  | 73,646 |  |  | 73,593
| Equivalent shares from outstanding stock options(1) |  | 336 |  |  | 559 |  |  | 402 |  |  | 591
| Denominator for diluted calculation |  | 74,054 |  |  | 74,530 |  |  | 74,048 |  |  | 74,184
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
| Basic | $ | 1.91 |  | $ | 1.68 |  | $ | 3.59 |  | $ | 3.71
| Diluted | $ | 1.91 |  | $ | 1.66 |  | $ | 3.57 |  | $ | 3.68
| (1) Year-to-date amounts are the weighted average of the individual quarterly amounts.

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