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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)

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