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Goodwill (Additional Disclosures) (Details)
$ in Thousands
1 Months Ended 12 Months Ended
May. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
reporting_unit
segment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Goodwill [Line Items]        
Number of reporting units | reporting_unit   5    
Number of reporting units with goodwill balance | segment   4    
Goodwill acquired $ 39,300 $ 1,689 $ 4,860  
Final Florida Chemical acquisition adjustment   0 1,162 $ 0
Energy Chemistry Technologies [Member]        
Goodwill [Line Items]        
Goodwill acquired 18,700 0 6,022  
Consumer and Industrial Chemistry Technologies [Member]        
Goodwill [Line Items]        
Goodwill acquired $ 20,600 $ 0 $ (1,162)