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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2018 |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 660,821 |  |  | $ | 721,996 |  |  | $ | 734,846 |  |  | $ | 817,923 |
Gross profit | $ | 374,933 |  |  | $ | 412,625 |  |  | $ | 419,254 |  |  | $ | 477,566 |
Net earnings | $ | 93,304 |  |  | $ | 111,468 |  |  | $ | 126,653 |  |  | $ | 181,186 |
Basic earnings per common share: |  |  |  |  |  |  |
Net earnings | $ | 3.66 |  |  | $ | 4.41 |  |  | $ | 5.04 |  |  | $ | 7.25 |
Weighted average number of common shares | 25,468,323 |  |  | 25,299,414 |  |  | 25,126,061 |  |  | 24,975,303 |
Diluted earnings per common share: |  |  |  |  |  |  |
Net earnings | $ | 3.58 |  |  | $ | 4.31 |  |  | $ | 4.93 |  |  | $ | 7.11 |
Weighted average number of common and common equivalent shares | 26,095,647 |  |  | 25,867,383 |  |  | 25,683,365 |  |  | 25,490,270 |
Market price per share: |  |  |  |  |  |  |
High | $ | 692.30 |  |  | $ | 595.14 |  |  | $ | 617.94 |  |  | $ | 645.33 |
Low | $ | 566.87 |  |  | $ | 546.43 |  |  | $ | 559.44 |  |  | $ | 524.03 |
2017 |  |  |  |  |  |  |  |  |  |  |
Net sales | $ | 594,567 |  |  | $ | 653,656 |  |  | $ | 698,799 |  |  | $ | 778,031 |
Gross profit | $ | 343,389 |  |  | $ | 375,612 |  |  | $ | 400,975 |  |  | $ | 455,775 |
Net earnings | $ | 92,466 |  |  | $ | 101,580 |  |  | $ | 104,950 |  |  | $ | 76,976 |
Basic earnings per common share: |  |  |  |  |  |  |  |  |  |
Net earnings | $ | 3.57 |  |  | $ | 3.94 |  |  | $ | 4.10 |  |  | $ | 3.01 |
Weighted average number of common shares | 25,932,112 |  |  | 25,751,374 |  |  | 25,613,433 |  |  | 25,562,542 |
Diluted earnings per common share: |  |  |  |  |  |  |  |  |  |
Net earnings | $ | 3.48 |  |  | $ | 3.84 |  |  | $ | 3.99 |  |  | $ | 2.93 |
Weighted average number of common and common equivalent shares | 26,586,061 |  |  | 26,439,529 |  |  | 26,303,529 |  |  | 26,229,052 |
Market price per share: |  |  |  |  |  |  |  |  |  |
High | $ | 486.90 |  |  | $ | 601.16 |  |  | $ | 635.17 |  |  | $ | 689.11 |
Low | $ | 414.52 |  |  | $ | 473.87 |  |  | $ | 571.25 |  |  | $ | 606.80 |

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- Definition QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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