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Quarterly Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Data [Abstract] |
Schedule Of Quarterly Financial Information |
|  |  |  | 2019 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 602,820 |  | $ | 601,602 |  | $ | 555,229 |  | $ | 508,444
| Gross profit |  | 53,800 |  |  | 52,998 |  |  | 52,883 |  |  | 40,725
| Net income (loss) |  | 13,773 |  |  | 9,447 |  |  | 7,136 |  |  | (6,931)
| Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | 0.34 |  |  | 0.25 |  |  | 0.19 |  |  | (0.19)
|  | Diluted |  | 0.34 |  |  | 0.24 |  |  | 0.19 |  |  | (0.19)
|  |  |  | 2018 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 608,136 |  | $ | 660,591 |  | $ | 640,688 |  | $ | 657,050
| Gross profit |  | 58,318 |  |  | 54,299 |  |  | 52,777 |  |  | 55,199
| Net income (loss) |  | (23,641) |  |  | 10,943 |  |  | 7,799 |  |  | 27,716
| Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | (0.49) |  |  | 0.23 |  |  | 0.17 |  |  | 0.64
|  | Diluted |  | (0.49) |  |  | 0.23 |  |  | 0.17 |  |  | 0.64
|  |  |  | 2017 Quarter
(in thousands, except per share data) |  | 1st |  |  | 2nd |  |  | 3rd |  |  | 4th
| Sales | $ | 557,903 |  | $ | 619,611 |  | $ | 610,929 |  | $ | 666,036
| Gross profit |  | 47,532 |  |  | 59,484 |  |  | 58,243 |  |  | 60,661
| Net income (loss) |  | 8,555 |  |  | 18,074 |  |  | 17,831 |  |  | (76,361)
| Earnings (loss) per share: |  |  |  |  |  |  |  |  |  |  |
|  | Basic |  | 0.17 |  |  | 0.36 |  |  | 0.36 |  |  | (1.54)
|  | Diluted |  | 0.17 |  |  | 0.36 |  |  | 0.35 |  |  | (1.54)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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