Goodwill and Other Identifiable Intangible Assets - Summary of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amortized intangible assets:
Weighted Average Amortization Period	17 years 3 months 18 days	13 years 9 months 18 days
Gross Carrying Amount	$ 48,822	$ 26,227
Foreign Exchange	(1,648)	(517)
Accumulated Amortization	(13,688)	(19,749)
Net Carrying Amount	33,486	5,961
Amortization expense	1,800	1,700	$ 2,200
Identifiable intangible assets
Gross Carrying Amount	56,184
Foreign Exchange	(1,953)
Net Carrying Amount	40,543	$ 5,961
Estimated amortization expense to be recognized during the next five years
2017	2,243
2018	2,250
2019	2,041
2020	1,953
2021	1,910
Trade names and trademarks
Indefinite lived intangible assets:
Gross Carrying Amount	7,362
Foreign Exchange	(305)
Indefinite-Lived Intangible Assets (Excluding Goodwill), Total	$ 7,057
Patents
Amortized intangible assets:
Weighted Average Amortization Period		20 years
Gross Carrying Amount		$ 676
Accumulated Amortization		(656)
Net Carrying Amount		$ 20
Customer relationships
Amortized intangible assets:
Weighted Average Amortization Period	18 years 10 months 24 days	15 years 10 months 24 days
Gross Carrying Amount	$ 25,035	$ 10,450
Foreign Exchange	(873)	(303)
Accumulated Amortization	(8,900)	(9,526)
Net Carrying Amount	$ 15,262	$ 621
Product certification
Amortized intangible assets:
Weighted Average Amortization Period	7 years 4 months 24 days	7 years 2 months 12 days
Gross Carrying Amount	$ 8,649	$ 10,954
Foreign Exchange	(90)	(95)
Accumulated Amortization	(4,320)	(6,259)
Net Carrying Amount	$ 4,239	$ 4,600
Unpatented technology and know-how
Amortized intangible assets:
Weighted Average Amortization Period	20 years	20 years
Gross Carrying Amount	$ 14,174	$ 3,183
Foreign Exchange	(586)
Accumulated Amortization	(114)	(2,996)
Net Carrying Amount	$ 13,474	$ 187
Licenses
Amortized intangible assets:
Weighted Average Amortization Period	20 years	20 years
Gross Carrying Amount	$ 964	$ 964
Foreign Exchange	(99)	(119)
Accumulated Amortization	(354)	(312)
Net Carrying Amount	$ 511	$ 533