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REVENUE RECOGNITION (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 27, 2014	Dec. 28, 2013	Sep. 28, 2013
REVENUE RECOGNITION [Abstract]
Cost and Earnings in Excess of Billings	$ 6,883	$ 6,903	$ 9,640
Billings in Excess of Cost and Earnings	$ 3,940	$ 2,858	$ 2,655
Construction contracts completion term, minimum	6 months
Construction contracts completion term, maximum	18 months

Liability attributable to (i) billings in excess of costs under the percentage of completion contract accounting method representing the difference between contractually invoiced amounts (billings) and revenue recognized based, for example, on costs incurred to estimated total costs at period end or (ii) contractually invoiced amounts (billings) in excess of costs incurred and accumulated under the completed contract accounting method that are expected to be realized within one year or one operating cycle, whichever is longer, from the reporting date.

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