Annual report pursuant to Section 13 and 15(d)

Restructuring and Other Related Costs - Components of Restructuring and Other Related Costs (Details)

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Restructuring and Other Related Costs - Components of Restructuring and Other Related Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs $ 6,208 $ 8,490 $ 12,630
Other related costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs 5,323 2,949 7,537
Eco Services Restructuring Plan | Employee severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs 0 830 5,093
Performance Materials Plant Closure | Employee severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs $ 885 $ 4,711 $ 0