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ACQUISITIONS (Supplemental Unaudited Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Income per share:
Effective income tax rate reconciliation, percent	22.80%	22.10%
Zycron, Inc.
Business Acquisition [Line Items]
Revenues	$ 73,782	$ 214,659
Gross profit	19,196	54,391
Net income	$ 3,203	$ 6,992
Income per share:
Basic pro forma (in usd per share)	$ 0.37	$ 0.80
Diluted pro forma (in usd per share)	$ 0.35	$ 0.78
Pro Forma
Income per share:
Effective income tax rate reconciliation, percent		36.80%
Pro Forma | Revolving Credit Facility
Income per share:
Line of credit facility, interest rate during period	4.50%

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