Non-Operating Income and Deductions, Net (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Non-Operating Deductions, Net [Abstract]
Interest income	$ 700,000	$ 700,000	$ 2,100,000	$ 2,500,000
Interest expense	(800,000)	(800,000)	(2,600,000)	(2,400,000)
Foreign exchange gains (losses)	(900,000)	(100,000)	(1,500,000)	(800,000)
Other deductions	(200,000)	(400,000)	(600,000)	(1,300,000)
Non-operating deductions, net	$ (1,234,000)	$ (650,000)	$ (2,572,000)	$ (2,016,000)