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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
Schedule Of Quarterly Financial Information |
|  |  |  | 2016 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 549,225 |  | $ | 579,342 |  | $ | 574,341 |  | $ | 607,507
| Gross profit |  | 50,317 |  |  | 52,854 |  |  | 52,822 |  |  | 57,470
| Net income |  | 11,052 |  |  | 12,685 |  |  | 21,742 |  |  | 18,568
| Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | 0.22 |  |  | 0.26 |  |  | 0.44 |  |  | 0.38
|  | Diluted |  | 0.22 |  |  | 0.26 |  |  | 0.44 |  |  | 0.37
|  |  |  | 2015 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 620,925 |  | $ | 664,038 |  | $ | 630,191 |  | $ | 625,719
| Gross profit |  | 51,785 |  |  | 55,997 |  |  | 54,563 |  |  | 56,909
| Net income |  | 14,205 |  |  | 21,210 |  |  | 20,565 |  |  | 39,421
| Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | 0.27 |  |  | 0.41 |  |  | 0.40 |  |  | 0.78
|  | Diluted |  | 0.27 |  |  | 0.40 |  |  | 0.40 |  |  | 0.77
|  |  |  | 2014 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 639,344 |  | $ | 716,868 |  | $ | 731,302 |  | $ | 709,547
| Gross profit |  | 51,153 |  |  | 57,757 |  |  | 55,299 |  |  | 56,107
| Net income |  | 19,439 |  |  | 21,558 |  |  | 16,906 |  |  | 23,338
| Earnings per common share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | 0.36 |  |  | 0.40 |  |  | 0.32 |  |  | 0.44
|  | Diluted |  | 0.36 |  |  | 0.40 |  |  | 0.31 |  |  | 0.44

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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=68076893&loc=d3e1280-108306 + Details
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