Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Intangible Assets
Gross	$ 37,864	$ 38,550
Accumulated Amortization	(12,115)	(11,342)
Net	25,749	27,207
Customer list [Member]
Intangible Assets
Amortization Period (Years)	10 years	10 years
Gross	12,311	12,619
Accumulated Amortization	(1,925)	(1,673)
Net	10,386	10,946
Patents and product rights [Member]
Intangible Assets
Gross	10,449	10,449
Accumulated Amortization	(7,061)	(6,926)
Net	3,388	3,523
Patents and product rights [Member] | Minimum [Member]
Intangible Assets
Amortization Period (Years)	3 years	3 years
Patents and product rights [Member] | Maximum [Member]
Intangible Assets
Amortization Period (Years)	10 years	10 years
Acquired technology [Member]
Intangible Assets
Amortization Period (Years)	7 years	7 years
Gross	9,563	9,802
Accumulated Amortization	(2,104)	(1,829)
Net	7,459	7,973
Tradename [Member]
Intangible Assets
Amortization Period (Years)	15 years	15 years
Gross	4,719	4,837
Accumulated Amortization	(510)	(443)
Net	4,209	4,394
Non-compete agreements [Member]
Intangible Assets
Gross	822	842
Accumulated Amortization	(515)	(471)
Net	$ 307	$ 371
Non-compete agreements [Member] | Minimum [Member]
Intangible Assets
Amortization Period (Years)	1 year	1 year
Non-compete agreements [Member] | Maximum [Member]
Intangible Assets
Amortization Period (Years)	3 years	3 years