Goodwill And Other Identifiable Intangible Assets (Changes In Carrying Amounts Of Goodwill By Segment) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Beginning balance	$ 26,910	$ 26,934
Foreign currency translation	(71)	(24)
Ending balance	26,839	26,910
Activated Carbon And Service [Member]
Goodwill [Line Items]
Beginning balance	20,183	20,305
Foreign currency translation	(16)	(122)
Ending balance	20,167	20,183
Equipment [Member]
Goodwill [Line Items]
Beginning balance	6,667	6,569
Foreign currency translation	(55)	98
Ending balance	6,612	6,667
Consumer [Member]
Goodwill [Line Items]
Beginning balance	60	60
Foreign currency translation
Ending balance	$ 60	$ 60

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

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- Definition

The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Subparagraph e

-Paragraph 45

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Subparagraph e

-Paragraph 45

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Subparagraph e

-Paragraph 45

-Clause 6

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Publisher FASB

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