Acquisitions and Purchase Accounting Acquisitions and Purchase Accounting - Pro Forma Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Apr. 04, 2015	Mar. 29, 2014
Business Combinations [Abstract]
Business Acquisition, Pro Forma Revenue	$ 408,934	$ 405,100
Business Acquisition, Pro Forma Net Income (Loss)	$ 38,525	$ 36,633
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.68	$ 0.65
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.68	$ 0.65

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.

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=56956515&loc=d3e1392-128463

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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.

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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.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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