Business Combinations - Pro Forma (Details) - CTG Advanced - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 28, 2015	Jun. 30, 2016	Jun. 28, 2015
Business Acquisition, Pro Forma Information
Net sales	$ 98,693	$ 103,689	$ 197,710	$ 205,290
Net earnings	$ 14,487	$ 19,640	$ 22,249	$ 26,298
Basic (usd per share)	$ 0.44	$ 0.59	$ 0.68	$ 0.79
Diluted (usd per share)	$ 0.44	$ 0.59	$ 0.67	$ 0.78

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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