STOCK-BASED COMPENSATION (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 3,231	$ 3,141	$ 10,058	$ 8,588
Cost of sales
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	367	271	1,048	762
Selling, general and administrative expense
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	2,490	2,508	7,812	6,809
Research and development expense
Total stock-based compensation expense included in the Company's consolidated statements of operations
Stock-based compensation expense	$ 374	$ 362	$ 1,198	$ 1,017