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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Quarterly Financial Data [Abstract] |  |  |
Schedule Of Quarterly Financial Information |
|  | 2011 Quarter |
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th |
Sales |  | $ | 538,312 |  |  | $ | 585,549 |  |  | $ | 570,083 |  |  | $ | 559,086 |
Gross profit |  |  | 37,624 |  |  |  | 37,751 |  |  |  | 34,635 |  |  |  | 28,825 |
Net income |  |  | 14,513 |  |  |  | 14,701 |  |  |  | 19,867 |  |  |  | 2,878 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.24 |  |  |  | 0.24 |  |  |  | 0.34 |  |  |  | 0.05 |
Diluted |  |  | 0.24 |  |  |  | 0.24 |  |  |  | 0.34 |  |  |  | 0.05 |
|  | 2010 Quarter |
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th |
Sales |  | $ | 571,905 |  |  | $ | 589,449 |  |  | $ | 613,864 |  |  | $ | 626,925 |
Gross profit |  |  | 45,237 |  |  |  | 46,254 |  |  |  | 47,192 |  |  |  | 48,732 |
Net income |  |  | 18,142 |  |  |  | 20,137 |  |  |  | 22,469 |  |  |  | 19,010 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.29 |  |  |  | 0.32 |  |  |  | 0.36 |  |  |  | 0.31 |
Diluted |  |  | 0.28 |  |  |  | 0.32 |  |  |  | 0.36 |  |  |  | 0.31 |
|  | 2009 Quarter |
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th |
Sales |  | $ | 496,767 |  |  | $ | 481,802 |  |  | $ | 510,461 |  |  | $ | 600,223 |
Gross profit |  |  | 31,636 |  |  |  | 34,500 |  |  |  | 36,534 |  |  |  | 43,395 |
Net income |  |  | 9,238 |  |  |  | 11,501 |  |  |  | 16,137 |  |  |  | 16,505 |
Earnings per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 0.14 |  |  |  | 0.18 |  |  |  | 0.25 |  |  |  | 0.26 |
Diluted |  |  | 0.14 |  |  |  | 0.18 |  |  |  | 0.25 |  |  |  | 0.25 |

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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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