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Summary of Significant Accounting Policies (Details 1) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (55,726) | $ (51,749)
Intangible Assets, Gross (Excluding Goodwill) | 169,738 | 169,313
Tradename (indefinite life) [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount, Tradename (indefinite life) | 25,089 | 25,061
Customer Relationships [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 96,874 | 96,575
Accumulated Amortization | (24,371) | (21,928)
Proven technology and patents [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 42,817 | 42,960
Accumulated Amortization | (29,178) | (28,014)
Tradename (finite life) [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 4,205 | 3,972
Accumulated Amortization | (1,520) | (1,345)
Other Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 753 | 745
Accumulated Amortization | $ (657) | $ (462)

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