Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Net loss	$ (9,585)	$ (43,302)	$ (23,102)	$ (285,392)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2,043)	(5,525)	(4,323)	(2,014)
Unrealized gain (loss) on investments	16	(13)	42	(13)
Pension plan adjustments	(2,543)	(3,095)	(5,771)	(6,190)
Less: amortization of benefit plan costs	1,330	976	2,664	1,953
Net pension plan adjustments	(1,213)	(2,119)	(3,107)	(4,237)
Total other comprehensive loss	(3,240)	(7,657)	(7,388)	(6,264)
Total comprehensive loss	$ (12,825)	$ (50,959)	$ (30,490)	$ (291,656)