Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2015

Goodwill and Other Identifiable Intangible Assets

Schedule of changes in carrying amount of goodwill by segment

	Activated
	Carbon and			Equipment			Consumer
	Service Segment			Segment			Segment		Total
Balance as of January 1, 2014	$	19,961		$	6,531		$	60	$	26,552
Foreign currency translation	(208		)	(147		)	—		(355		)
Balance as of December 31, 2014	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

Summary of identifiable intangible assets

	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

	December 31, 2014
	Weighted
	Average	Gross								Net
	Amortization	Carrying		Foreign			Accumulated			Carrying
	Period	Amount		Exchange			Amortization			Amount
Amortized intangible assets:
Patents	20.0 Years	$	676	$	—		$	(636	)	$	40
Customer Relationships	15.9 Years	10,450		(270		)	(9,198		)	982
Product Certification	6.0 Years	9,470		(62		)	(5,182		)	4,226
Unpatented Technology	18.4 Years	3,183		—			(2,722		)	461
Licenses	20.0 Years	964		(117		)	(275		)	572
Total	12.7 Years	$	24,743	$	(449	)	$	(18,013	)	$	6,281

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

For the year ending December 31:
2016	$	1,549
2017	901
2018	717
2019	510
2020	420