Goodwill And Other Intangible Assets (Amortized Intangible Assets) (Details) (USD $)	9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Dec. 31, 2010	Oct. 01, 2011 Current Technology [Member]	Dec. 31, 2010 Current Technology [Member]	Oct. 01, 2011 Patent And Patent Rights [Member]	Dec. 31, 2010 Patent And Patent Rights [Member]	Oct. 01, 2011 Customer Relationships [Member]	Dec. 31, 2010 Customer Relationships [Member]	Apr. 02, 2011 Continuing Operations [Member]	Apr. 02, 2011 Discontinued Operations [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 31,851,000		$ 31,651,000	$ 12,718,000	$ 12,718,000	$ 17,360,000	$ 17,160,000	$ 1,773,000	$ 1,773,000
Accumulated Amortization	(24,410,000)		(21,896,000)	(11,300,000)	(10,863,000)	(11,389,000)	(9,351,000)	(1,721,000)	(1,682,000)
Net Amount	7,441,000		9,755,000	1,418,000	1,855,000	5,971,000	7,809,000	52,000	91,000
Amortization expense	2,514,000	2,320,000
Goodwill	$ 79,703,000		$ 79,703,000							$ 9,114,000	$ 72,795,000