Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narratives (Details)

v3.10.0.1
Goodwill and Other Intangible Assets - Narratives (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
segment
reporting_unit
Dec. 31, 2017
USD ($)
segment
reporting_unit
Dec. 31, 2016
USD ($)
Goodwill      
Number of reporting units | reporting_unit 4 4,000  
Number of operating segments | segment 2 2,000  
Goodwill $ 1,254,929 $ 1,305,956 $ 1,241,429
Intangible asset impairment charge 0 0 6,873
Amortization of intangible assets included in other operating expense, net 35,025 32,010 25,263
Cost of goods sold      
Goodwill      
Amortization of intangible assets included in cost of goods sold 17,569 20,579 13,573
Other operating expenses      
Goodwill      
Amortization of intangible assets included in other operating expense, net 35,025 32,010 25,263
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 $ 865,278 $ 914,623 $ 852,506