Annual report pursuant to Section 13 and 15(d)

Goodwill and Other Intangible Assets - Narratives (Details)

v3.20.4
Goodwill and Other Intangible Assets - Narratives (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Goodwill      
Number of reporting units 3    
Goodwill impairment charge $ 260,000 $ 0 $ 0
Goodwill 717,738 973,578 969,674
Amortization expense 26,923 26,888 27,258
Performance Chemicals      
Goodwill      
Goodwill impairment charge 260,000    
Goodwill 326,173 583,075 580,023
Cost of goods sold      
Goodwill      
Amortization expense 9,369 13,877 13,579
Other operating expenses      
Goodwill      
Amortization expense $ 26,923 $ 26,888 $ 27,258