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QUARTERLY DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2011
Schedule of Quarterly Financial Information |
|  |  | 1st |  |  |  | 2nd |  |  |  | 3rd |  |  |  | 4th |  |  |  | Total Year |
|  |  | (dollars in thousands, except per share data) |  |  |  |
2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 182,572 |  |  | $ | 210,855 |  |  | $ | 218,720 |  |  | $ | 243,760 |  |  | $ | 855,907 |
Gross profit |  |  | 71,830 |  |  |  | 85,337 |  |  |  | 87,318 |  |  |  | 99,652 |  |  |  | 344,137 |
Income from operations |  |  | 31,364 |  |  |  | 35,248 |  |  |  | 37,186 |  |  |  | 44,912 |  |  |  | 148,710 |
Net earnings |  | $ | 17,825 |  |  | $ | 19,628 |  |  | $ | 23,461 |  |  | $ | 34,559 |  |  | $ | 95,473 |
Basic earnings per share (1) |  | $ | 1.00 |  |  | $ | 1.09 |  |  | $ | 1.30 |  |  | $ | 1.92 |  |  | $ | 5.30 |
Diluted earnings per share (1) |  | $ | 0.97 |  |  | $ | 1.06 |  |  | $ | 1.26 |  |  | $ | 1.87 |  |  | $ | 5.15 |
2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales |  | $ | 160,683 |  |  | $ | 173,412 |  |  | $ | 177,793 |  |  | $ | 207,233 |  |  | $ | 719,121 |
Gross profit |  |  | 63,473 |  |  |  | 69,424 |  |  |  | 70,687 |  |  |  | 83,093 |  |  |  | 286,677 |
Income from operations |  |  | 26,435 |  |  |  | 29,729 |  |  |  | 32,011 |  |  |  | 34,613 |  |  |  | 122,788 |
Net earnings |  | $ | 13,762 |  |  | $ | 17,509 |  |  | $ | 20,602 |  |  | $ | 20,994 |  |  | $ | 72,867 |
Basic earnings per share (1) |  | $ | 0.78 |  |  | $ | 0.98 |  |  | $ | 1.16 |  |  | $ | 1.18 |  |  | $ | 4.09 |
Diluted earnings per share (1) |  | $ | 0.74 |  |  | $ | 0.96 |  |  | $ | 1.13 |  |  | $ | 1.13 |  |  | $ | 3.97 |
| (1) | Sum of quarters may not equal the total for the year due to changes in the number of shares outstandingduring the 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 -Topic 270 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph (a)-(j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6952194&loc=d3e1280-108306 + Details
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