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Restructuring - Net Pretax Benefits (Charges), Incurred by Segment (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) employee
Restructuring Cost and Reserve [Line Items] |  |  |
Approximate Number of Employees | employee | 40 | 162 | 29
Restructuring charges | $ 2,045 | $ 10,372 | $ 3,503
Changes in estimates | (486) | (12) |
Total pretax charge, net of reversals | 1,559 | 10,360 | 3,503
All Other and Corporate |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 881 | 5,264 | 2,209
Changes in estimates | (276) | (2) |
Total pretax charge, net of reversals | 605 | 5,262 | 2,209
Refined Coal | Operating Segments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 0 | 0 | 0
Changes in estimates | 0 | 0 |
Total pretax charge, net of reversals | 0 | 0 | 0
Emissions Control | Operating Segments |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | 1,164 | 5,108 | 1,294
Changes in estimates | (210) | (10) |
Total pretax charge, net of reversals | $ 954 | $ 5,098 | $ 1,294

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