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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
QUARTERLY FINANCIAL DATA (Unaudited) | QUARTERLY FINANCIAL DATA (Unaudited) 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. The sum of quarterly earnings per share may not equal total year earnings per share due to rounding of earnings per share amounts, and differences in weighted-average shares and equivalent shares outstanding for each of the periods presented.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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