Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Finite and Indefinite-Lived Intangible Assets, Gross, Total	$ 166,719	$ 166,617
Total Accumulated Amortization	(48,280)	(45,207)
Tradename (indefinite life) [Member]
Intangible Assets [Line Items]
Gross amount, Tradename (indefinite life)	24,982	25,033
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross amount	96,238	95,203
Accumulated Amortization	(20,307)	(18,735)
Proven technology and patents [Member]
Intangible Assets [Line Items]
Gross amount	40,789	41,643
Accumulated Amortization	(26,433)	(25,174)
Tradename (finite life) [Member]
Intangible Assets [Line Items]
Gross amount	3,975	3,995
Accumulated Amortization	(1,224)	(1,072)
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Gross amount	735	743
Accumulated Amortization	$ (316)	$ (226)