Quarterly report pursuant to Section 13 or 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
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring and other related costs $ 4,106 $ 1,336 $ 5,578 $ 10,898
Minimum        
Restructuring Cost and Reserve [Line Items]        
Estimated remaining restructuring costs 500   500  
Maximum        
Restructuring Cost and Reserve [Line Items]        
Estimated remaining restructuring costs 1,000   1,000  
Other related costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other related costs 238 1,336 880 6,402
Legacy Eco Restructuring Plan | Severance and other employee costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other related costs 0 0 830 4,496
Performance Materials Plant Closure | Severance and other employee costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other related costs $ 3,868 $ 0 $ 3,868 $ 0