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Quarterly Financial Information (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | Summarized quarterly financial data for 2015 and 2014 are presented below. Seasonal influences affect the Company’s sales and profits, with peak business occurring in May through August. (in thousands, except per share amounts)
| 2015 |  | 2014
| First | Second | Third | Fourth |  | First | Second | Third | Fourth
Sales | $ | 207,798 |  | $ | 215,734 |  | $ | 231,614 |  | $ | 224,431 |  |  | $ | 172,610 |  | $ | 207,751 |  | $ | 234,783 |  | $ | 223,911 |
Gross profit | 45,537 |  | 50,665 |  | 57,509 |  | 48,737 |  |  | 38,130 |  | 47,286 |  | 55,440 |  | 48,372 |
Net income | 7,359 |  | 9,710 |  | 14,756 |  | 11,384 |  |  | 7,238 |  | 9,195 |  | 13,367 |  | 11,351 |
Earnings per share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted | $ | 0.64 |  | $ | 0.84 |  | $ | 1.28 |  | $ | 0.99 |  |  | $ | 0.59 |  | $ | 0.75 |  | $ | 1.10 |  | $ | 1.00 |
Average shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted | 11,436 |  | 11,498 |  | 11,496 |  | 11,500 |  |  | 12,270 |  | 12,276 |  | 12,205 |  | 11,403 |
Dividends per share | $ | 0.08 |  | 0.08 |  | $ | 0.08 |  | $ | 0.08 |  |  | $ | 0.07 |  | $ | 0.07 |  | $ | 0.07 |  | $ | 0.07 |
Market price of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
High | $ | 63.39 |  | $ | 64.45 |  | $ | 55.12 |  | $ | 57.51 |  |  | $ | 60.65 |  | $ | 57.86 |  | $ | 55.84 |  | $ | 52.13 |
Low | $ | 44.74 |  | $ | 48.10 |  | $ | 44.48 |  | $ | 43.98 |  |  | $ | 46.87 |  | $ | 49.50 |  | $ | 40.75 |  | $ | 37.93 |

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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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