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Restructuring - Net Pretax Benefits (Charges), Incurred by Segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
employee
Jun. 30, 2016
USD ($)
employee
Restructuring Cost and Reserve [Line Items]    
Approximate Number of Employees | employee 19 22
Restructuring charges $ 784 $ 1,067
Changes in estimates 0 0
Total pretax charge, net of reversals 784 1,067
All Other and Corporate    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 316 599
Changes in estimates 0 0
Total pretax charge, net of reversals 316 599
Refined Coal | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 0 0
Changes in estimates 0 0
Total pretax charge, net of reversals 0 0
Emissions Control | Operating Segments    
Restructuring Cost and Reserve [Line Items]    
Restructuring charges 468 468
Changes in estimates 0 0
Total pretax charge, net of reversals $ 468 $ 468