Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Finite and Indefinite-Lived Intangible Assets, Gross, Total	$ 168,487	$ 169,313
Total Accumulated Amortization	(53,991)	(51,749)
Tradename (indefinite life) [Member]
Intangible Assets [Line Items]
Gross amount, Tradename (indefinite life)	25,038	25,061
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross amount	96,357	96,575
Accumulated Amortization	(23,522)	(21,928)
Proven technology and patents [Member]
Intangible Assets [Line Items]
Gross amount	42,210	42,960
Accumulated Amortization	(28,491)	(28,014)
Tradename (finite life) [Member]
Intangible Assets [Line Items]
Gross amount	4,137	3,972
Accumulated Amortization	(1,469)	(1,345)
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Gross amount	745	745
Accumulated Amortization	$ (509)	$ (462)