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Restructuring (Tables) | 9 Months Ended
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Sep. 30, 2015
Restructuring and Related Activities [Abstract] |
Restructuring and Related Costs | A summary of the net pretax charges, incurred by segment, for each period is as follows:
|  |  |  | Pretax Charge
(in thousands, except employee data) |  | Approximate Number of Employees |  | Refined Coal |  | Emission Control - ACI |  | Emissions Control - BCSI |  | Research & Development |  | All Other and Corporate |  | Total
Three Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 109 |  |  | $ | — |  |  | $ | 316 |  |  | $ | 364 |  |  | $ | 1,937 |  |  | $ | 116 |  |  | $ | 2,733 |
Total pretax charge, net of reversals |  |  |  | $ | — |  |  | $ | 316 |  |  | $ | 364 |  |  | $ | 1,937 |  |  | $ | 116 |  |  | $ | 2,733 |
Nine Months Ended September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 154 |  |  | $ | — |  |  | $ | 2,030 |  |  | $ | 364 |  |  | $ | 2,023 |  |  | $ | 4,358 |  |  | $ | 8,775 |
Changes in estimates |  |  |  | — |  |  | (10 | ) |  | — |  |  | — |  |  | (2 | ) |  | (12 | )
Total pretax charge, net of reversals |  |  |  | $ | — |  |  | $ | 2,020 |  |  | $ | 364 |  |  | $ | 2,023 |  |  | $ | 4,356 |  |  | $ | 8,763 |
Three Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 5 |  |  | $ | — |  |  | $ | 408 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,598 |  |  | $ | 2,006 |
Total pretax charge, net of reversals |  |  |  | $ | — |  |  | $ | 408 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,598 |  |  | $ | 2,006 |
Nine Months Ended September 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 23 |  |  | $ | — |  |  | $ | 760 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,612 |  |  | $ | 2,372 |
Total pretax charge, net of reversals |  |  |  | $ | — |  |  | $ | 760 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,612 |  |  | $ | 2,372 |
Schedule of Restructuring Reserve by Type of Cost | The following table summarizes the Company’s utilization of restructuring accruals for the nine months ended September 30, 2015:
(in thousands) |  | Employee Severance |  | Business Operations Closure |  | Total
Remaining accrual as of December 31, 2014 |  | $ | 1,690 |  |  | $ | — |  |  | $ | 1,690 |
Expense provision (1) |  | 6,902 |  |  | 1,873 |  |  | 8,775 |
Cash payments and other (1) |  | (5,502 | ) |  | (1,873 | ) |  | (7,375 | )
Change in estimates |  | (12 | ) |  | — |  |  | (12 | )
Remaining accrual as of September 30, 2015 |  | $ | 3,078 |  |  | $ | — |  |  | $ | 3,078 |
(1) Included within the Expense provision and Cash payments and other line items in the above table is equity based compensation of $3.1 million for the nine months ended September 30, 2015, resulting from the accelerated vesting of modified equity-based compensation awards for certain terminated employees. Additionally, as discussed in Note 3, due to restructuring activities the Company fully impaired the carrying value of certain assets, thereby recognizing net impairment expense in the amount of $1.9 million during the third quarter of 2015.

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: 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) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 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 + Details
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- Definition Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 + Details
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