STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2014	Jun. 29, 2013	Jun. 28, 2014	Jun. 29, 2013
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 3,110,000	$ 1,876,000	$ 5,447,000	$ 4,145,000
Unrecognized total compensation cost
Unrecognized stock-based compensation expense related to non-vested stock-based awards	24,400,000		24,400,000
Weighted-average period over which unrecognized stock-based compensation cost is expected to be recognized			2 years 2 months 12 days
Cost of Sales [Member]
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	279,000	244,000	491,000	453,000
Selling, General and Administrative Expenses [Member]
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	2,465,000	1,373,000	4,301,000	3,193,000
Research and Development Expense [Member]
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 366,000	$ 259,000	$ 655,000	$ 499,000