Goodwill and Other Intangible Assets (Details 1) (USD $)	Jul. 02, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	$ 50,971,000	$ 35,484,000
Accumulated Amortization	23,499,000	22,041,000
Customer relationships and lists [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	43,421,000	28,194,000
Accumulated Amortization	18,824,000	17,638,000
Patents and developed technology [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	6,856,000	6,596,000
Accumulated Amortization	4,212,000	3,974,000
Distributor agreements [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	374,000	374,000
Accumulated Amortization	257,000	237,000
Product names [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Gross carrying value	320,000	320,000
Accumulated Amortization	$ 206,000	$ 192,000