Stock-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014 Cost of products sold	Sep. 28, 2013 Cost of products sold	Sep. 27, 2014 Cost of products sold	Sep. 28, 2013 Cost of products sold	Sep. 27, 2014 Research and development	Sep. 28, 2013 Research and development	Sep. 27, 2014 Research and development	Sep. 28, 2013 Research and development	Sep. 27, 2014 Selling, general and administrative	Sep. 28, 2013 Selling, general and administrative	Sep. 27, 2014 Selling, general and administrative	Sep. 28, 2013 Selling, general and administrative	Jun. 28, 2014 Restricted stock	Mar. 29, 2014 Restricted stock	Sep. 27, 2014 Restricted stock tranch	Mar. 29, 2014 Q1 2014 Grant Restricted stock	Jun. 28, 2014 Q2 2014 Grant Restricted stock	Sep. 27, 2014 Q2 2014 Grant Restricted stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 3,133	$ 2,562	$ 9,543	$ 6,985	$ 215	$ 171	$ 592	$ 460	$ 1,356	$ 1,058	$ 3,744	$ 2,871	$ 1,562	$ 1,333	$ 5,207	$ 3,654				$ 500	$ 200	$ 700
RSU's granted during the period																	49,296		98,592
Number of tranches for the options																			2
RSU's vested during the period																		49,296