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Restructuring | 6 Months Ended
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Jun. 30, 2017
Restructuring and Related Activities [Abstract] |
Restructuring | Restructuring The Company recorded restructuring charges during the three and six months ended June 30, 2016 in connection with a reduction in force, the departure of certain executive officers and management's further alignment of the business with strategic objectives. These charges related to severance arrangements with departing employees and executives, as well as non-cash charges related to the acceleration of vesting of certain stock awards. There were no material restructuring charges during the three and six months ended June 30, 2017. A summary of the net pretax charges, incurred by segment, excluding facility charges shown below, is as follows:
|  |  |  | Pretax Charge
(in thousands, except employee data) |  | Approximate Number of Employees |  | Refined Coal |  | Emissions Control |  | All Other and Corporate |  | Total
Three Months Ended June 30, 2016 |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 19 |  | $ | — |  |  | $ | 468 |  |  | $ | 316 |  |  | $ | 784 |
Changes in estimates |  |  |  | — |  |  | — |  |  | — |  |  | — |
Total pretax charge, net of reversals |  |  |  | $ | — |  |  | $ | 468 |  |  | $ | 316 |  |  | $ | 784 |
Six Months Ended June 30, 2016 |  |  |  |  |  |  |  |  |  |
Restructuring charges |  | 22 |  | $ | — |  |  | $ | 468 |  |  | $ | 599 |  |  | $ | 1,067 |
Changes in estimates |  |  |  | — |  |  | — |  |  | — |  |  | — |
Total pretax charge, net of reversals |  |  |  | $ | — |  |  | $ | 468 |  |  | $ | 599 |  |  | $ | 1,067 |
The following table summarizes the Company's change in restructuring accruals for the six months ended June 30, 2017:
(in thousands) |  | Employee Severance |  | Facility Closures
Remaining accrual as of December 31, 2016 |  | $ | 452 |  |  | $ | 247 |
Expense provision |  | 76 |  |  | — |
Cash payments and other |  | (426 | ) |  | (250 | )
Change in estimates |  | (21 | ) |  | 3 |
Remaining accrual as of June 30, 2017 |  | $ | 81 |  |  | $ | — |
Restructuring accruals are included within the Accrued payroll and related liabilities line item in the Condensed Consolidated Balance Sheets. Restructuring expenses are included within the Payroll and benefits line item in the Condensed Consolidated Statements of Operations.

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -URI http://asc.fasb.org/topic&trid=2175745 + Details
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