Goodwill and Other Identifiable Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2013

Goodwill and Other Identifiable Intangible Assets

Schedule of the changes in the carrying amounts of goodwill by segment

	Activated
	Carbon and			Equipment			Consumer
(Dollars in thousands)	Service Segment			Segment			Segment		Total
Balance as of January 1, 2012	$	20,167		$	6,612		$	60	$	26,839
Foreign currency translation	143			48			—		191
Balance as of December 31, 2012	20,310			6,660			60		27,030
Restructuring (Note 2)	(419		)	—			—		(419		)
Foreign currency translation	70			(129		)	—		(59		)
Balance as of December 31, 2013	$	19,961		$	6,531		$	60	$	26,552

Summary of identifiable intangible assets

	December 31, 2013
	Weighted
	Average	Gross								Net
	Amortization	Carrying		Foreign			Accumulated			Carrying
(Dollars in thousands)	Period	Amount		Exchange			Amortization			Amount
Amortized intangible assets:
Patents	20.0Years	$	676	$	—		$	(592	)	$	84
Customer Relationships	15.9 Years	10,450		(209		)	(8,777		)	1,464
Product Certification	5.4 Years	7,905		(34		)	(5,237		)	2,634
Unpatented Technology	18.4 Years	3,183		—			(2,457		)	726
Licenses	20.0 Years	964		(43		)	(227		)	694
Total	12.9 Years	$	23,178	$	(286	)	$	(17,290	)	$	5,602

	December 31, 2012
	Weighted
	Average	Gross								Net
	Amortization	Carrying		Foreign			Accumulated			Carrying
(Dollars in thousands)	Period	Amount		Exchange			Amortization			Amount
Amortized intangible assets:
Patents	20.0 Years	$	676	$	—		$	(548	)	$	128
Customer Relationships	15.9 Years	10,450		(223		)	(8,311		)	1,916
Product Certification	5.4 Years	7,369		(3		)	(3,917		)	3,449
Unpatented Technology	18.4 Years	3,183		—			(2,191		)	992
Licenses	20.0 Years	964		119			(180		)	903
Total	13.1 Years	$	22,642	$	(107	)	$	(15,147	)	$	7,388

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

For the year ending December 31:	(Dollars in thousands)
2014	$	2,026
2015	1,360
2016	1,132
2017	333
2018	141