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Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Assets	$ 65,305			$ 93,699
Equity method investments	18,546			19,584
Clean Coal Solutions (CCS)
Segment Reporting Information [Line Items]
Equity method investments	0	$ 0	$ 0	0	$ 0	$ 0	$ 0	$ 0
Operating Segments | Refined Coal
Segment Reporting Information [Line Items]
Assets	21,062			21,322
Operating Segments | Emissions Control - Engineering Technology Services
Segment Reporting Information [Line Items]
Assets	20,233			34,175
Operating Segments | Emissions Control - Manufacturing
Segment Reporting Information [Line Items]
Assets	8,291			11,285
Operating Segments | Research and Development
Segment Reporting Information [Line Items]
Assets	5,225			6,431
All Other and Corporate
Segment Reporting Information [Line Items]
Assets	$ 10,494			$ 20,486

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
-Article 7

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570

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