Goodwill and Other Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Year		Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 40,938		$ 39,251
Finite-Lived Intangible Assets, Accumulated Amortization	19,133		16,884
Goodwill	35,946		34,209
Other indefinite lived intangible assets	1,268		1,269
Total goodwill and other indefinite lived intangible assets	37,214		35,478
Developed Technology Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	13,174		12,405
Finite-Lived Intangible Assets, Accumulated Amortization	9,942		9,101
Finite-Lived Intangible Assets, Weighted Average Useful Life	5.3	[1]
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	6,154		5,840
Finite-Lived Intangible Assets, Accumulated Amortization	1,655		1,339
Finite-Lived Intangible Assets, Weighted Average Useful Life	11.9	[1]
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	21,601		20,997
Finite-Lived Intangible Assets, Accumulated Amortization	7,529		6,438
Finite-Lived Intangible Assets, Weighted Average Useful Life	11.5	[1]
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	9		9
Finite-Lived Intangible Assets, Accumulated Amortization	$ 7		$ 6
Finite-Lived Intangible Assets, Weighted Average Useful Life	3.6	[1]

[1] (a) Weighted average life is as of September 30, 2012