Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Other Identifiable Intangible Assets

Schedule of changes in carrying amount of goodwill by segment

	Activated
	Carbon and		Equipment		Consumer		Other
	Service Segment		Segment		Segment		Segment		Total
Balance as of January 1, 2015	$	19,753	$	6,384	$	60	$	—	$	26,197
Foreign currency translation		(149)		(271)		—		—		(420)
Balance as of December 31, 2015		19,604		6,113		60		—		25,777
Acquisition		—		—		—		42,844		42,844
Foreign currency translation		(551)		47		—		(1,801)		(2,305)
Balance as of December 31, 2016	$	19,053	$	6,160	$	60	$	41,043	$	66,316

Summary of identifiable intangible assets

	December 31, 2016
	Weighted
	Average		Gross						Net
	Amortization		Carrying		Foreign		Accumulated		Carrying
	Period		Amount		Exchange		Amortization		Amount
Amortized intangible assets:
Customer relationships	18.9	Years	$	25,035	$	(873)	$	(8,900)	$	15,262
Product certification	7.4	Years		8,649		(90)		(4,320)		4,239
Unpatented technology	20.0	Years		14,174		(586)		(114)		13,474
Licenses	20.0	Years		964		(99)		(354)		511
	17.3	Years		48,822		(1,648)		(13,688)		33,486
Indefinite lived intangible assets:
Trade names and trademarks				7,362		(305)		—		7,057
Total			$	56,184	$	(1,953)	$	(13,688)	$	40,543

	December 31, 2015
	Weighted
	Average		Gross						Net
	Amortization		Carrying		Foreign		Accumulated		Carrying
	Period		Amount		Exchange		Amortization		Amount
Amortized intangible assets:
Patents	20.0	Years	$	676	$	—	$	(656)	$	20
Customer relationships	15.9	Years		10,450		(303)		(9,526)		621
Product certification	7.2	Years		10,954		(95)		(6,259)		4,600
Unpatented technology	20.0	Years		3,183		—		(2,996)		187
Licenses	20.0	Years		964		(119)		(312)		533
Total	13.8	Years	$	26,227	$	(517)	$	(19,749)	$	5,961

Schedule of estimated amortization expense to be recognized during next five years

For the year ending December 31:
2017	$	2,243
2018		2,250
2019		2,041
2020		1,953
2021		1,910