Annual report pursuant to Section 13 and 15(d)

Restructuring and Other Related Costs - Schedule of Restructuring Reserve (Details)

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Restructuring and Other Related Costs - Schedule of Restructuring Reserve (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Reserve      
Beginning balance $ 3,338 $ 1,643 $ 1,293
Restructuring charges 581 5,541 5,093
Other adjustments 304    
Cash payments (2,953) (3,846) (4,743)
Ending balance 1,270 3,338 1,643
Eco Services Restructuring Plan      
Restructuring Reserve      
Beginning balance 215 1,643 1,293
Restructuring charges 0 830 5,093
Other adjustments 0    
Cash payments (215) (2,258) (4,743)
Ending balance 0 215 1,643
Performance Materials Plant Closure      
Restructuring Reserve      
Beginning balance 3,123 0 0
Restructuring charges 581 4,711 0
Other adjustments 304    
Cash payments (2,738) (1,588) 0
Ending balance $ 1,270 $ 3,123 $ 0