Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Net loss	$ (13,517)	$ (242,090)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(2,280)	3,501
Unrealized gain on investments	26	11
Pension plan adjustments	(3,228)	(3,096)
Less: amortization of benefit plan costs	1,334	977
Net pension plan adjustments	(1,894)	(2,119)
Total other comprehensive (loss) income	(4,148)	1,393
Total comprehensive loss	$ (17,665)	$ (240,697)