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Acquisitions and Purchase Accounting Acquisitions and Purchase Accounting - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Business Combinations [Abstract] |  |
Business Acquisition, Pro Forma Revenue | $ 587,242 | $ 597,078
Business Acquisition, Pro Forma Net Income (Loss) | $ 67,081 | $ 65,750
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ 1.21 | $ 1.15
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ 1.21 | $ 1.15

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- Definition The pro forma basic net income per share for a 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma diluted net income per share for a 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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