Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015 item	Mar. 31, 2014
Segment Information
Number of reportable segments	3us-gaap_NumberOfReportableSegments
Segment Information
Net Sales	$ 135,703us-gaap_SalesRevenueNet	$ 131,632us-gaap_SalesRevenueNet
Income from operations	17,290us-gaap_OperatingIncomeLoss	15,601us-gaap_OperatingIncomeLoss
Restructuring income		103us-gaap_RestructuringCharges
Interest income	11us-gaap_InvestmentIncomeInterest	10us-gaap_InvestmentIncomeInterest
Interest expense	(131)us-gaap_InterestExpense	(109)us-gaap_InterestExpense
Other expense - net	(548)us-gaap_OtherNonoperatingIncomeExpense	(546)us-gaap_OtherNonoperatingIncomeExpense
Income before income tax provision	16,622	14,956
Depreciation and amortization	8,701	7,029
Activated Carbon and Service
Segment Information
Net Sales	122,747	117,723
Depreciation and amortization	7,835	6,176
Equipment
Segment Information
Net Sales	10,708	10,468
Depreciation and amortization	713	695
Consumer
Segment Information
Net Sales	2,248	3,441
Depreciation and amortization	153	158
Business operating segments
Segment Information
Income from operations	17,290	15,498
Business operating segments \| Activated Carbon and Service
Segment Information
Income from operations	18,055	16,493
Business operating segments \| Equipment
Segment Information
Income from operations	(1,160)	(1,682)
Business operating segments \| Consumer
Segment Information
Income from operations	$ 395	$ 687

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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