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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Summarized quarterly financial data for 2017 and 2016 are presented below. Seasonal influences affect the Company’s sales and profits, with heavier business occurring in May through August. (in thousands, except per share amounts)
| 2017 |  | 2016
| First | Second | Third | Fourth(1) |  | First | Second | Third | Fourth
Sales | $ | 215,389 |  | $ | 213,276 |  | $ | 240,455 |  | $ | 243,260 |  |  | $ | 210,971 |  | $ | 211,489 |  | $ | 216,766 |  | $ | 205,522 |
Gross profit | 54,164 |  | 54,679 |  | 64,939 |  | 60,911 |  |  | 50,277 |  | 52,178 |  | 54,711 |  | 47,933 |
Net income | 12,167 |  | 12,316 |  | 16,592 |  | 3,240 |  |  | 8,659 |  | 10,562 |  | 13,236 |  | 7,588 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted | $ | 1.05 |  | $ | 1.05 |  | $ | 1.42 |  | $ | 0.27 |  |  | $ | 0.75 |  | $ | 0.92 |  | $ | 1.14 |  | $ | 0.65 |
Average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted | 11,620 |  | 11,671 |  | 11,708 |  | 11,727 |  |  | 11,507 |  | 11,550 |  | 11,595 |  | 11,608 |
Dividends per share | $ | 0.10 |  | $ | 0.10 |  | $ | 0.10 |  | $ | 0.10 |  |  | $ | 0.09 |  | $ | 0.09 |  | $ | 0.09 |  | $ | 0.09 |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High | $ | 79.50 |  | $ | 92.67 |  | $ | 107.69 |  | $ | 119.50 |  |  | $ | 61.82 |  | $ | 66.01 |  | $ | 68.04 |  | $ | 78.91 |
Low | $ | 71.20 |  | $ | 71.72 |  | $ | 86.80 |  | $ | 104.87 |  |  | $ | 48.26 |  | $ | 52.82 |  | $ | 61.49 |  | $ | 59.55 |
(1) The Net income for the fourth quarter of 2017 includes a one-time charge of $10.1 million relating to the U.S. tax reform act.

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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/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=84173487&loc=d3e1280-108306 + Details
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