Goodwill and Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward]
Intangible assets net beginning balance	$ 52,465
Amortization	(2,930)	$ (2,833)	$ (514)
Intangible assets net ending balance	56,017	52,465
In-process research and development (IPR&D)
Indefinite-lived Intangible Assets [Roll Forward]
Indefinite intangible assets net beginning balance	17,024	14,351
Acquisition		2,811
IPR&D placed in service	(834)
Impairment	(113)
Foreign currency translation	2,234	(138)
Indefinite intangible assets net ending balance	18,311	17,024	14,351
Trademarks and Technology
Finite-lived Intangible Assets [Roll Forward]
Intangible assets net beginning balance	32,280	36,552
Acquisition		661
Amortization	(2,561)	(2,472)
Finite-lived Intangible Assets Acquired, In-process Research and Development Placed in Service	834
Foreign currency translation	4,143	(2,461)
Intangible assets net ending balance	34,696	32,280	36,552
Customer relationships
Finite-lived Intangible Assets [Roll Forward]
Intangible assets net beginning balance	3,161	3,417
Acquisition		0
Amortization	(369)	(361)
Foreign currency translation	218	105
Intangible assets net ending balance	$ 3,010	$ 3,161	$ 3,417