Income Taxes (Details) (USD $) In Thousands	9 Months Ended
	Oct. 01, 2011
Income Taxes [Abstract]
Company's Deferred Tax Assets In Israel	$ 10,000
Increase in liabilities for unrecognized tax benefits	2,900
Unrecognized tax benefits increases resulting from current period tax positions	900
Unrecognized tax benefits increases resulting from prior period tax positions	4,800
Unrecognized tax benefits decreases resulting from settlements with taxing authorities	(5,400)
Unrecognized tax benefits increases resulting from interest	3,000
Unrecognized tax benefits decreases resulting from foreign currency exchange effects	(400)
Tax expense recorded for uncertain tax positions, including interest	$ 5,800