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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Schedule Of Quarterly Financial Information |
|  |  |  | 2017 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 566,501 |  | $ | 616,904 |  | $ | 603,550 |  | $ | 679,856
| Gross profit |  | 49,060 |  |  | 58,587 |  |  | 58,155 |  |  | 61,895
| Net income (loss) |  | 9,687 |  |  | 17,176 |  |  | 17,512 |  |  | (76,340)
| Earnings (loss) per common share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | 0.20 |  |  | 0.35 |  |  | 0.35 |  |  | (1.54)
|  | Diluted |  | 0.19 |  |  | 0.34 |  |  | 0.35 |  |  | (1.54)
|  |  |  | 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

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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=84173487&loc=d3e1280-108306 + Details
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