Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Dec. 31, 2011
Other intangible assets and goodwill
Gross Carrying Amount	$ 72,388	$ 63,463
Accumulated Amortization	(34,622)	(33,077)
Customer lists/relationships [Member]
Other intangible assets and goodwill
Gross Carrying Amount	53,923	51,424
Accumulated Amortization	(23,730)	(22,390)
Patents [Member]
Other intangible assets and goodwill
Gross Carrying Amount	10,319	10,319
Accumulated Amortization	(10,319)	(10,319)
Other intangibles [Member]
Other intangible assets and goodwill
Gross Carrying Amount	2,291	1,220
Accumulated Amortization	(573)	(368)
Total [Member]
Other intangible assets and goodwill
Gross Carrying Amount	66,533	62,963
Accumulated Amortization	(34,622)	(33,077)
Goodwill [Member]
Other intangible assets and goodwill
Gross Carrying Amount	5,855	500
Accumulated Amortization