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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2011
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table sets forth the computation of net income per share on a basic and diluted basis for the years ended December 31 (shares in thousands):
|  | 2011 |  | 2010 |  | 2009 |
Net income attributable to shareholders |  | $ | 598,810 |  |  | $ | 479,630 |  |  | $ | 123,512 |  |
Net income per share: |  |  |  |  |  |  |  |  |
Basic |  | $ | 5.25 |  |  | $ | 4.06 |  |  | $ | 1.03 |  |
Diluted (a) |  | $ | 5.17 |  |  | $ | 4.01 |  |  | $ | 1.03 |  |
Weighted average shares outstanding - basic |  | 114,025 |  |  | 117,997 |  |  | 119,800 |  |
Net effect of various dilutive stock-based compensation awards |  | 1,907 |  |  | 1,580 |  |  | 689 |  |
Weighted average shares outstanding - diluted |  | 115,932 |  |  | 119,577 |  |  | 120,489 |  |
(a) | Stock-based compensation awards for the issuance of 1,051 shares, 3,257 shares, and 3,851 shares for the years ended December 31, 2011, 2010, and 2009, respectively, were excluded from the computation of net income per share on a diluted basis as their effect is anti-dilutive.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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