Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Indefinite-lived Intangible Assets:
Gross Book Value	$ 8,275		$ 8,275		$ 8,416
Foreign Currency Translation	(73)		(73)		56
Net Book Value	8,202		8,202		8,472
Finite-Lived Intangible Assets:
Accumulated Amortization	(4,509)		(4,509)		(2,700)
Intangible Assets:
Gross Book Value	40,285		40,285		41,036
Accumulated Amortization	(4,509)		(4,509)		(2,700)
Foreign Currency Translation	(241)		(241)		72
Net Book Value	35,535		35,535		38,408
Amortization of intangible assets	600	$ 600	1,700	$ 1,800
Patents
Finite-Lived Intangible Assets:
Gross Book Value	5,950		5,950		5,946
Accumulated Amortization	(1,309)		(1,309)		(968)
Foreign Currency Translation	(32)		(32)		80
Net Book Value	4,609		4,609		5,058
Intangible Assets:
Accumulated Amortization	(1,309)		$ (1,309)		$ (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	25,889		$ 25,889		$ 26,503
Accumulated Amortization	(3,101)		(3,101)		(1,675)
Foreign Currency Translation	(136)		(136)		(64)
Net Book Value	22,652		22,652		24,764
Intangible Assets:
Accumulated Amortization	(3,101)		$ (3,101)		$ (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	(99)		(99)		(57)
Foreign Currency Translation	0		0		0
Net Book Value	72		72		114
Intangible Assets:
Accumulated Amortization	$ (99)		$ (99)		$ (57)
Estimated Useful Lives			3 years		3 years