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Restructuring - Net Pretax Benefits (Charges), Incurred by Segment (Details)
$ in Thousands
 12 Months Ended
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