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Financial Results by Quarter | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Financial Results by Quarter | Financial Results by Quarter (Unaudited)
|  | Three Months Ended
(In thousands— except per-share amounts) |  | March 31, |  | June 30, |  | September 30, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Net sales |  | $ | 437,525 |  |  | $ | 437,204 |  |  | $ | 429,663 |  |  | $ | 436,671 |  |  | $ | 426,504 |  |  | $ | 435,320 |  |  | $ | 436,716 |  |  | $ | 425,568 |
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  | (387,030 | ) |  | (368,647 | ) |  | (380,733 | ) |  | (361,851 | ) |  | (386,581 | ) |  | (396,605 | ) |  | (375,277 | ) |  | (368,524 | )
Selling, general and administrative expenses |  | (29,937 | ) |  | (30,795 | ) |  | (29,265 | ) |  | (34,655 | ) |  | (34,472 | ) |  | (29,435 | ) |  | (34,785 | ) |  | (32,934 | )
Total operating costs and expenses |  | (416,967 | ) |  | (399,442 | ) |  | (409,998 | ) |  | (396,506 | ) |  | (421,053 | ) |  | (426,040 | ) |  | (410,062 | ) |  | (401,458 | )
Income from operations |  | 20,558 |  |  | 37,762 |  |  | 19,665 |  |  | 40,165 |  |  | 5,451 |  |  | 9,280 |  |  | 26,654 |  |  | 24,110 |
Net earnings |  | $ | 7,515 |  |  | $ | 18,446 |  |  | $ | 8,037 |  |  | $ | 20,864 |  |  | $ | 863 |  |  | $ | 901 |  |  | $ | 80,924 |  |  | $ | 9,343 |
Net earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.46 |  |  | $ | 1.05 |  |  | $ | 0.49 |  |  | $ | 1.22 |  |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | 4.92 |  |  | $ | 0.56 |
Diluted |  | 0.45 |  |  | 1.05 |  |  | 0.48 |  |  | 1.21 |  |  | 0.05 |  |  | 0.05 |  |  | 4.88 |  |  | 0.56 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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