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Restructuring - Net Pretax Benefits (Charges), Incurred by Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) employee	Sep. 30, 2014 USD ($) employee	Sep. 30, 2015 USD ($) employee	Sep. 30, 2014 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Approximate Number of Employees | employee	109	5	154	23
Restructuring charges	$ 2,733	$ 2,006	$ 8,775	$ 2,372
Changes in estimates			(12)
Total pretax charge, net of reversals	2,733	2,006	8,763	2,372
Refined Coal
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	0	0	0
Changes in estimates			0
Total pretax charge, net of reversals	0	0	0	0
Emission Control - ACI
Restructuring Cost and Reserve [Line Items]
Restructuring charges	316	408	2,030	760
Changes in estimates			(10)
Total pretax charge, net of reversals	316	408	2,020	760
Emissions Control - BCSI
Restructuring Cost and Reserve [Line Items]
Restructuring charges	364	0	364	0
Changes in estimates			0
Total pretax charge, net of reversals	364	0	364	0
Research & Development
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,937	0	2,023	0
Changes in estimates			0
Total pretax charge, net of reversals	1,937	0	2,023	0
All Other and Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring charges	116	1,598	4,358	1,612
Changes in estimates			(2)
Total pretax charge, net of reversals	$ 116	$ 1,598	$ 4,356	$ 1,612

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Restructuring Accrual Reversals

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- Definition

The number of positions eliminated during the period as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.P.3)
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 5
-Section P
-Subsection 3, 4

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

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