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Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Intangible Assets [Line Items] |  |
Finite and Indefinite-Lived Intangible Assets, Gross, Total | $ 242,352 | $ 241,185
Total Accumulated Amortization | (76,876) | (74,130)
Intangible Assets, Net (Excluding Goodwill) | 165,476 | 167,055
Tradename (indefinite life) [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount, Tradename (indefinite life) | 28,339 | 28,272
Intangible Assets, Net (Excluding Goodwill) | 28,339 | 28,272
Customer Relationships [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 147,776 | 147,466
Accumulated Amortization | (36,190) | (34,672)
Intangible Assets, Net (Excluding Goodwill) | 111,586 | 112,794
Proven technology and patents [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 59,057 | 58,394
Accumulated Amortization | (35,981) | (35,128)
Intangible Assets, Net (Excluding Goodwill) | 23,076 | 23,266
Tradename (indefinite life) [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 4,296 | 4,182
Accumulated Amortization | (2,738) | (2,514)
Intangible Assets, Net (Excluding Goodwill) | 1,558 | 1,668
Other Intangible Assets [Member] |  |
Intangible Assets [Line Items] |  |
Gross amount | 2,884 | 2,871
Accumulated Amortization | (1,967) | (1,816)
Intangible Assets, Net (Excluding Goodwill) | $ 917 | $ 1,055

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