Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Restructuring and Other Related Costs - Components of Restructuring and Other Related Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs $ 8,490 $ 12,630 $ 4,147
Minimum      
Restructuring Cost and Reserve [Line Items]      
Estimated remaining restructuring costs 500    
Maximum      
Restructuring Cost and Reserve [Line Items]      
Estimated remaining restructuring costs 1,000    
Other related costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs 2,949 7,537 176
Legacy Eco Restructuring Plan | Severance and other employee costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs 830 5,093 3,971
Legacy Eco Restructuring Plan | Employee severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs 830 5,093 1,293
Legacy Eco Restructuring Plan | One-time benefit arrangements      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs     2,678
Performance Materials Plant Closure | Severance and other employee costs      
Restructuring Cost and Reserve [Line Items]      
Restructuring and other related costs $ 4,711 $ 0 $ 0