Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Intangible Assets [Line Items]
Finite and Indefinite-Lived Intangible Assets, Gross, Total	$ 315,589	$ 315,510
Total Accumulated Amortization	(101,612)	(98,202)
Intangible Assets, Net (Excluding Goodwill)	213,977	217,308
Tradename (indefinite life) [Member]
Intangible Assets [Line Items]
Gross amount, Tradename (indefinite life)	35,479	35,500
Intangible Assets, Net (Excluding Goodwill)	35,479	35,500
Customer Relationships [Member]
Intangible Assets [Line Items]
Gross amount	197,916	197,942
Accumulated Amortization	(52,318)	(49,887)
Intangible Assets, Net (Excluding Goodwill)	145,598	148,055
Proven technology and patents [Member]
Intangible Assets [Line Items]
Gross amount	73,906	73,880
Accumulated Amortization	(43,518)	(42,750)
Intangible Assets, Net (Excluding Goodwill)	30,388	31,130
Tradename (indefinite life) [Member]
Intangible Assets [Line Items]
Gross amount	4,580	4,504
Accumulated Amortization	(2,914)	(2,874)
Intangible Assets, Net (Excluding Goodwill)	1,666	1,630
Other Intangible Assets [Member]
Intangible Assets [Line Items]
Gross amount	3,708	3,684
Accumulated Amortization	(2,862)	(2,691)
Intangible Assets, Net (Excluding Goodwill)	$ 846	$ 993