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 ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Cost and Reserve        
Restructuring and other related costs $ 273,000 $ 4,106,000 $ 403,000 $ 5,578,000
Other related costs        
Restructuring Cost and Reserve        
Restructuring and other related costs 54,000 238,000 77,000 880,000
Performance Materials Plant Closure | Employee Severance        
Restructuring Cost and Reserve        
Restructuring and other related costs 219,000 3,868,000 326,000 3,868,000
Legacy Eco Restructuring Plan | Employee Severance        
Restructuring Cost and Reserve        
Restructuring and other related costs $ 0 $ 0 $ 0 $ 830,000