Accumulated Other Comprehensive Loss Schedule of Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Before-tax amount
Foreign currency translation adjustments	$ 2,966	$ (11,583)	$ 931	$ (3,998)
Unrealized gain (loss) on investments	35	(5)	46	(16)
Amortization of benefit plan costs	(2,119)	563	(6,356)	1,746
Total other comprehensive income (loss), before tax	882	(11,025)	(5,379)	(2,268)
Tax (provision) benefit
Foreign currency translation adjustments	0	0	0	0
Unrealized gain (loss) on investments	(11)	2	(14)	6
Amortization of benefit plan costs	0	(253)	0	(623)
Total other comprehensive loss, tax (provision) benefit	(11)	(251)	(14)	(617)
After-tax amount
Foreign currency translation adjustments	2,966	(11,583)	931	(3,998)
Unrealized gain (loss) on investments	24	(3)	32	(10)
Amortization of benefit plan costs	(2,119)	310	(6,356)	1,123
Total other comprehensive income (loss)	$ 871	$ (11,276)	$ (5,393)	$ (2,885)