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Financial Results by Quarter Financial Results by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 436,716 | $ 426,504 | $ 429,663 | $ 437,525 | $ 425,568 | $ 435,320 | $ 436,671 | $ 437,204 | $ 1,730,408 | $ 1,734,763 | $ 1,752,401
Costs and expenses: |  |  |  |  |  |  |  |  |  |  |
Cost of sales | (375,277) | (386,581) | (380,733) | (387,030) | (368,524) | (396,605) | (361,851) | (368,647) | (1,529,621) | (1,495,627) | (1,512,849)
Selling, general and administrative expenses | (34,785) | (34,472) | (29,265) | (29,937) | (32,934) | (29,435) | (34,655) | (30,795) | (128,459) | (127,819) | (115,882)
Total operating costs and expenses | (410,062) | (421,053) | (409,998) | (416,967) | (401,458) | (426,040) | (396,506) | (399,442) | (1,658,080) | (1,623,446) | (1,628,731)
Income from operations | 26,654 | 5,451 | 19,665 | 20,558 | 24,110 | 9,280 | 40,165 | 37,762 | 72,328 | 111,317 | 123,670
Net earnings | $ 80,924 | $ 863 | $ 8,037 | $ 7,515 | $ 9,343 | $ 901 | $ 20,864 | $ 18,446 | $ 97,339 | $ 49,554 | $ 55,983
Net earnings per common share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 4.92 | $ 0.05 | $ 0.49 | $ 0.46 | $ 0.56 | $ 0.05 | $ 1.22 | $ 1.05 | $ 5.91 | $ 2.91 | $ 2.98
Diluted (in dollars per share) | $ 4.88 | $ 0.05 | $ 0.48 | $ 0.45 | $ 0.56 | $ 0.05 | $ 1.21 | $ 1.05 | $ 5.88 | $ 2.90 | $ 2.97

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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