Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Intangible assets
Net	$ 41,671,000
Trademarks	247,000		247,000
Intangible assets, net	41,918,000		44,249,000
Amortization expense of intangible assets	2,000,000	1,400,000
Estimate of future amortization expense for acquired intangible assets
April 1,2013 to December 31, 2013	6,137,000
2014	7,298,000
2015	5,938,000
2016	5,685,000
2017	5,885,000
Thereafter	10,728,000
Net	41,671,000
Patents
Intangible assets
Gross	1,054,000		1,054,000
Less: accumulated amortization	(798,000)		(766,000)
Net	256,000		288,000
Weighted Average Useful Life	8 years
Estimate of future amortization expense for acquired intangible assets
Net	256,000		288,000
Technological know-how
Intangible assets
Gross	15,021,000		15,141,000
Less: accumulated amortization	(5,631,000)		(4,913,000)
Net	9,390,000		10,228,000
Weighted Average Useful Life	6 years 1 month 6 days
Estimate of future amortization expense for acquired intangible assets
Net	9,390,000		10,228,000
Customer relationships
Intangible assets
Gross	37,181,000		37,358,000
Less: accumulated amortization	(11,848,000)		(10,793,000)
Net	25,333,000		26,565,000
Weighted Average Useful Life	8 years 8 months 12 days
Estimate of future amortization expense for acquired intangible assets
Net	25,333,000		26,565,000
Covenants not to compete
Intangible assets
Gross	861,000		881,000
Less: accumulated amortization	(597,000)		(517,000)
Net	264,000		364,000
Weighted Average Useful Life	2 years
Estimate of future amortization expense for acquired intangible assets
Net	264,000		364,000
Strategic marketing agreement
Intangible assets
Gross	6,203,000		6,203,000
Less: accumulated amortization	(348,000)		(293,000)
Net	5,855,000		5,910,000
Weighted Average Useful Life	10 years
Estimate of future amortization expense for acquired intangible assets
Net	5,855,000		5,910,000
Tradenames
Intangible assets
Gross	816,000		843,000
Less: accumulated amortization	(243,000)		(196,000)
Net	573,000		647,000
Weighted Average Useful Life	3 years 10 months 24 days
Estimate of future amortization expense for acquired intangible assets
Net	$ 573,000		$ 647,000