Non-Operating Deductions, Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Non-Operating Deductions, Net [Abstract]
Interest income	$ 700,000	$ 1,100,000	$ 2,500,000	$ 2,900,000
Interest expense	(800,000)	(800,000)	(2,400,000)	(2,400,000)
Foreign exchange gains (losses)	(100,000)	(200,000)	(800,000)	(1,500,000)
Foreign currency translation loss upon liquidation	0	(1,400,000)	0	(1,400,000)
Other deductions	(400,000)	(400,000)	(1,300,000)	(900,000)
Non-operating deductions, net	(650,000)	(1,663,000)	(2,016,000)	(3,299,000)
Ownership Interest Divested (in hundredths0	50.00%		50.00%
Ownership interest retained in hundredths	20.00%		20.00%
Fair Value of remaining interest	$ 600,000		$ 600,000