Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Intangible Assets [Line Items]
Finite and Indefinite-Lived Intangible Assets, Gross, Total	$ 168,483	$ 166,617
Total Accumulated Amortization	(50,052)	(45,207)
Tradename (indefinite life) [Member]
Intangible Assets [Line Items]
Gross amount, Tradename (indefinite life)	25,024	25,033
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross amount	96,488	95,203
Accumulated Amortization	(21,088)	(18,735)
Proven technology and patents [Member]
Intangible Assets [Line Items]
Gross amount	42,242	41,643
Accumulated Amortization	(27,395)	(25,174)
Tradename (finite life) [Member]
Intangible Assets [Line Items]
Gross amount	3,987	3,995
Accumulated Amortization	(1,192)	(1,072)
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Gross amount	742	743
Accumulated Amortization	$ (377)	$ (226)