Goodwill And Other Intangible Assets (Amortized Intangible Assets) (Details) (USD $)	6 Months Ended	12 Months Ended
	Jul. 02, 2011	Dec. 31, 2010	Jul. 02, 2011 Current Technology [Member]	Dec. 31, 2010 Current Technology [Member]	Jul. 02, 2011 Patent And Patent Rights [Member]	Dec. 31, 2010 Patent And Patent Rights [Member]	Jul. 02, 2011 Customer Relationships [Member]	Dec. 31, 2010 Customer Relationships [Member]	Apr. 02, 2011 Continuing Operations [Member]	Apr. 02, 2011 Discontinued Operations [Member]
Gross Amount	$ 31,651,000	$ 31,651,000	$ 12,718,000	$ 12,718,000	$ 17,160,000	$ 17,160,000	$ 1,773,000	$ 1,773,000
Accumulated Amortization	(23,567,000)	(21,896,000)	(11,154,000)	(10,863,000)	(10,705,000)	(9,351,000)	(1,708,000)	(1,682,000)
Net Amount	8,084,000	9,755,000	1,564,000	1,855,000	6,455,000	7,809,000	65,000	91,000
Amortization expense	1,671,000	1,481,000
Goodwill	$ 79,703,000	$ 79,703,000							$ 9,114,000	$ 72,795,000