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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | A summary of the company's consolidated quarterly results of operations is as follows:
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,474,177 |  |  | $ | 5,972,101 |  |  | $ | 5,936,092 |  |  | $ | 6,442,891 |  |
Gross profit |  |  | 748,898 |  |  |  | 798,791 |  |  |  | 773,162 |  |  |  | 823,348 |  |
Net income attributable to shareholders |  |  | 106,235 |  |  |  | 134,270 |  |  |  | 117,727 |  |  |  | 164,518 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.16 |  |  | $ | 1.46 |  |  | $ | 1.29 |  |  | $ | 1.84 |  |
Diluted |  | $ | 1.14 |  |  | $ | 1.45 |  |  | $ | 1.28 |  |  | $ | 1.81 |  |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ | 5,002,385 |  |  | $ | 5,829,989 |  |  | $ | 5,698,304 |  |  | $ | 6,751,342 |  |
Gross profit |  |  | 685,322 |  |  |  | 768,595 |  |  |  | 742,367 |  |  |  | 838,966 |  |
Net income attributable to shareholders |  |  | 106,058 |  |  |  | 123,932 |  |  |  | 109,244 |  |  |  | 158,492 |  |
Net income per share (a): |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 1.11 |  |  | $ | 1.30 |  |  | $ | 1.16 |  |  | $ | 1.71 |  |
Diluted |  | $ | 1.09 |  |  | $ | 1.28 |  |  | $ | 1.15 |  |  | $ | 1.69 |  |
(a) | Quarterly net income per share is calculated using the weighted-average shares outstanding during each quarterly period, while net income per share for the full year is calculated using the weighted-average shares outstanding during the year. Therefore, the sum of the net income per share for each of the four quarters may not equal the net income per share for the full year.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 + Details
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