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Acquisitions and Dispositions - Condensed Pro Forma Consolidated Results of Operations (Details) - ATCO [Member] - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 29, 2018 | Sep. 30, 2017
Business Acquisition [Line Items] |  |
Net sales | $ 2,036,367 | $ 1,868,677
Net income | $ 84,823 | $ 82,523
Basic earnings per share (in dollars per share) | $ 1.49 | $ 1.45
Diluted earnings per share (in dollars per share) | $ 1.48 | $ 1.44

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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