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Net Income per Share | 6 Months Ended
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Jun. 30, 2018
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 (shares in thousands):
|  | Quarter Ended |  | Six Months Ended
|  | June 30, 2018 |  | July 1, 2017 |  | June 30, 2018 |  | July 1, 2017
Net income attributable to shareholders |  | $ | 169,915 |  |  | $ | 99,722 |  |  | $ | 309,009 |  |  | $ | 214,459 |
Weighted-average shares outstanding - basic |  | 87,802 |  |  | 88,876 |  |  | 87,878 |  |  | 89,079 |
Net effect of various dilutive stock-based compensation awards |  | 850 |  |  | 961 |  |  | 963 |  |  | 1,067 |
Weighted-average shares outstanding - diluted |  | 88,652 |  |  | 89,837 |  |  | 88,841 |  |  | 90,146 |
Net income per share: |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.94 |  |  | $ | 1.12 |  |  | $ | 3.52 |  |  | $ | 2.41 |
Diluted (a) |  | $ | 1.92 |  |  | $ | 1.11 |  |  | $ | 3.48 |  |  | $ | 2.38 |
(a) | Stock-based compensation awards for the issuance of 915 and 515 shares for the second quarter and first six months of 2018 and 432 and 328 shares for the second quarter and first six months of 2017, 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 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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