Business Combinations - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2016	Sep. 27, 2015	Sep. 30, 2016	Sep. 27, 2015
Business Acquisition, Pro Forma Information
Earnings Per Share, Basic	$ 0.11	$ (0.15)	$ 0.80	$ 0.62
Earnings Per Share, Diluted	$ 0.11	$ (0.15)	$ 0.79	$ 0.61
CTG Advanced
Business Acquisition, Pro Forma Information
Net sales	$ 99,697	$ 93,818	$ 297,407	$ 299,123
Net earnings	$ 3,720	$ (4,014)	$ 25,969	$ 22,301
Basic (usd per share)		$ (0.12)	$ 0.79	$ 0.67
Diluted (usd per share)		$ (0.12)	$ 0.78	$ 0.66

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.

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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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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