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Net Income 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 [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):
|  | 2012 |  | 2011 |  | 2010 |
Net income attributable to shareholders |  | $ | 506,332 |  |  | $ | 598,810 |  |  | $ | 479,630 |  |
Weighted-average shares outstanding - basic |  | 109,240 |  |  | 114,025 |  |  | 117,997 |  |
Net effect of various dilutive stock-based compensation awards |  | 1,837 |  |  | 1,907 |  |  | 1,580 |  |
Weighted-average shares outstanding - diluted |  | 111,077 |  |  | 115,932 |  |  | 119,577 |  |
Net income per share: |  |  |  |  |  |  |
Basic |  | $ | 4.64 |  |  | $ | 5.25 |  |  | $ | 4.06 |  |
Diluted (a) |  | $ | 4.56 |  |  | $ | 5.17 |  |  | $ | 4.01 |  |
(a) | Stock-based compensation awards for the issuance of 1,424 shares, 1,051 shares, and 3,257 shares for the years ended December 31, 2012, 2011, and 2010, 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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