Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Indefinite-lived Intangible Assets:
Gross Book Value	$ 8,197		$ 8,197		$ 8,416
Foreign Currency Translation	(64)		(64)		56
Net Book Value	8,133		8,133		8,472
Finite-Lived Intangible Assets:
Accumulated Amortization	(3,980)		(3,980)		(2,700)
Intangible Assets:
Gross Book Value	40,242		40,242		41,036
Accumulated Amortization	(3,980)		(3,980)		(2,700)
Foreign Currency Translation	(122)		(122)		72
Net Book Value	36,140		36,140		38,408
Amortization of intangible assets	500	$ 500	1,200	$ 1,200
Patents
Finite-Lived Intangible Assets:
Gross Book Value	5,950		5,950		5,946
Accumulated Amortization	(1,174)		(1,174)		(968)
Foreign Currency Translation	(22)		(22)		80
Net Book Value	4,754		4,754		5,058
Intangible Assets:
Accumulated Amortization	(1,174)		$ (1,174)		$ (968)
Patents | Minimum
Intangible Assets:
Estimated Useful Lives			15 years		15 years
Patents | Maximum
Intangible Assets:
Estimated Useful Lives			30 years		30 years
Customer relationships
Finite-Lived Intangible Assets:
Gross Book Value	25,924		$ 25,924		$ 26,503
Accumulated Amortization	(2,720)		(2,720)		(1,675)
Foreign Currency Translation	(36)		(36)		(64)
Net Book Value	23,168		23,168		24,764
Intangible Assets:
Accumulated Amortization	(2,720)		$ (2,720)		$ (1,675)
Customer relationships | Minimum
Intangible Assets:
Estimated Useful Lives			5 years		5 years
Customer relationships | Maximum
Intangible Assets:
Estimated Useful Lives			15 years		15 years
Non-compete agreements
Finite-Lived Intangible Assets:
Gross Book Value	171		$ 171		$ 171
Accumulated Amortization	(86)		(86)		(57)
Foreign Currency Translation	0		0		0
Net Book Value	85		85		114
Intangible Assets:
Accumulated Amortization	$ (86)		$ (86)		$ (57)
Estimated Useful Lives			3 years		3 years