COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
COMMITMENTS, CONTINGENCIES, AND GUARANTEES [Abstract]
Estimated costs to complete future remediation efforts	$ 3,500,000	$ 3,400,000	$ 3,500,000	$ 3,400,000
Anti Dumping Duty Assessment	887,000	2,000,000	887,000	2,328,000
Surety Bonds and Letters of Credit [Abstract]
Payment and performance bonds outstanding	32,200,000		32,200,000
Expiration period of surety bonds	2 years		2 years
Completed projects still under warranty	17,700,000		17,700,000
Outstanding letters of credit	26,500,000		26,500,000
Irrevocable letters of credit in favor of our insurers outstanding	16,700,000		16,700,000
Irrevocable letters of credit in favor of our industrial development revenue bonds outstanding	9,800,000		9,800,000
Approximate identification and removal of contaminants costs	600,000		600,000
Capital Addition Purchase Commitments [Member]
Long-term Purchase Commitment [Line Items]
Outstanding purchase commitments on capital projects			$ 12,300,000