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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | The following table presents the computation of net income per share on a basic and diluted basis for the years ended December 31 (shares in thousands):
|  | 2016 |  | 2015 |  | 2014
Net income attributable to shareholders |  | $ | 522,750 |  |  | $ | 497,726 |  |  | $ | 498,045 |
Weighted-average shares outstanding - basic |  | 90,960 |  |  | 94,608 |  |  | 98,675 |
Net effect of various dilutive stock-based compensation awards |  | 1,073 |  |  | 1,078 |  |  | 1,272 |
Weighted-average shares outstanding - diluted |  | 92,033 |  |  | 95,686 |  |  | 99,947 |
Net income per share: |  |  |  |  |  |
Basic |  | $ | 5.75 |  |  | $ | 5.26 |  |  | $ | 5.05 |
Diluted (a) |  | $ | 5.68 |  |  | $ | 5.20 |  |  | $ | 4.98 |
(a) | Stock-based compensation awards for the issuance of 766 shares, 658 shares, and 294 shares for the years ended December 31, 2016, 2015, and 2014, respectively, were excluded from the computation of net income per share on a diluted basis as their effect was anti-dilutive.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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