Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narratives (Details)

v3.8.0.1
Goodwill and Other Intangible Assets - Narratives (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
segment
reporting_unit
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 01, 2016
USD ($)
Goodwill        
Number of reporting units | reporting_unit 4      
Number of operating segments | segment 2      
Goodwill $ 1,305,956 $ 1,241,429 $ 311,892  
Intangible asset impairment charge 0 6,873 0  
Cost of goods sold        
Goodwill        
Amortization expense 20,579 13,573 3,605  
Other operating expenses        
Goodwill        
Amortization expense $ 32,010 25,263 6,605  
Corporate Tradenames        
Goodwill        
Percentage in excess of carrying value 2.00%      
Product Tradenames        
Goodwill        
Percentage in excess of carrying value 3.00%      
Performance Chemicals        
Goodwill        
Goodwill       $ 577,667
Performance Chemicals | Trade names        
Goodwill        
Intangible asset impairment charge   5,350    
Silica Catalysts | Trade names        
Goodwill        
Intangible asset impairment charge   1,523    
Performance Materials & Chemicals        
Goodwill        
Goodwill $ 914,623 $ 852,506 $ 0  
Percentage in excess of carrying value       10.00%