STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 2,445,000	$ 2,173,000	$ 6,590,000	$ 6,265,000
Unrecognized total compensation cost
Unrecognized stock-based compensation expense related to non-vested stock-based awards	17,600,000		17,600,000
Weighted-average period over which unrecognized stock-based compensation cost is expected to be recognized			2 years 1 month 6 days
Cost of sales
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	233,000	189,000	686,000	490,000
Selling, general and administrative expenses
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	1,921,000	1,767,000	5,114,000	5,075,000
Research and development expense
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 291,000	$ 217,000	$ 790,000	$ 700,000