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Net Income Per Share | 12 Months Ended
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Dec. 31, 2016
Earnings Per Share [Abstract] |
Net Income Per Share [Text Block] | Net Income Per Share 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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