Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 440,975
Net loss attributable to common stockholders for the nine months ended October 3, 2015	$ (24,862)	$ 9,406	(113,779)	$ 33,161
Unrealized (loss) gain related to marketable securities, net of tax	(130)	(210)	(133)	(280)
Recognized loss on redemption of marketable securities, previously unrealized	209	(1)	443	98
Translation adjustments, net of tax	(697)	(159)	(752)	579
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax			722
Stock repurchase			(6,970)
Retirement of treasury stock			0
Stock-based compensation expense related to stock options, ESPP and RSUs			13,609
Fair value of partially vested stock options and RSUs assumed in business acquisition			5,139
Defined benefit pension net actuarial losses	(1)	$ 0	(156)	$ 0
Noncontrolling Interest, Change in Redemption Value			(563)
Ending balance	338,535		338,535
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,173
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax			18
Stock repurchase			0
Retirement of treasury stock			(11)
Ending balance	1,180		1,180
Additional Paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			635,299
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax			704
Stock repurchase			0
Retirement of treasury stock			(6,959)
Stock-based compensation expense related to stock options, ESPP and RSUs			13,609
Fair value of partially vested stock options and RSUs assumed in business acquisition			5,139
Noncontrolling Interest, Change in Redemption Value			(563)
Ending balance	647,229		647,229
Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			0
Stock repurchase			(6,970)
Retirement of treasury stock			6,970
Ending balance	0		0
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(193,613)
Defined benefit pension net actuarial losses			0
Ending balance	(307,392)		(307,392)
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			(1,884)
Net loss attributable to common stockholders for the nine months ended October 3, 2015			(113,779)
Unrealized (loss) gain related to marketable securities, net of tax			(133)
Recognized loss on redemption of marketable securities, previously unrealized			443
Translation adjustments, net of tax			(752)
Defined benefit pension net actuarial losses			(156)
Ending balance	$ (2,482)		$ (2,482)