Condensed Consolidated Statements Of Equity (USD $) In Thousands	Total	Common stock	Additional paid-in capital	Retained deficit	Foreign currency translation adjustments [Member]	Defined benefit pension adjustments [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]
Balance at Dec. 31, 2012	$ 694,799	$ 1,385	$ 809,514	$ (157,038)	$ 41,997	$ (1,059)
Balance (in shares) at Dec. 31, 2012		138,458
Shares issued under stock plans (in shares)		1,687
Shares issued under stock plans	6,322	17	6,305	0	0	0
Share-based compensation expense	3,769	0	3,769	0	0	0
Repurchase and retirement of common stock (shares)		(970)
Repurchase and retirement of common stock	(9,382)	(10)	(5,663)	(3,709)	0	0
Tax benefit associated with stock plans	940	0	940	0	0	0
Pension liability adjustments	57	0	0	0	0	57
Foreign currency translation	(16,420)	0	0	0	(16,420)	0
Net (loss) income	36,178	0	0	36,178	0	0
Balance at Jun. 29, 2013	716,263	1,392	814,865	(124,569)	25,577	(1,002)
Balance (in shares) at Jun. 29, 2013		139,175
Balance at Dec. 31, 2013	756,843	1,387	819,632	(88,599)	25,280	(857)	0
Balance (in shares) at Dec. 31, 2013		138,734
Shares issued under stock plans, net of shares withheld for employee taxes (shares)		595
Shares issued under stock plans, net of shares withheld for employee taxes	(1,530)	6	(1,536)	0	0	0	0
Share-based compensation expense	4,155	0	4,155	0	0	0	0
Tax benefit associated with stock plans	837	0	837	0	0	0	0
Pension liability adjustments	19	0	0	0	0	19	0
Available for sale securities, change in net unrealized losses	(644)	0	0	0	0	0	(644)
Foreign currency translation	5,830	0	0	0	5,830	0	0
Net (loss) income	(357)	0	0	(357)		0	0
Balance at Jun. 28, 2014	$ 765,153	$ 1,393	$ 823,088	$ (88,956)	$ 31,110	$ (838)	$ (644)
Balance (in shares) at Jun. 28, 2014		139,329