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Related Parties - Narrative and Schedule of Related Party Transactions (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
related_party
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Equity Method Investee      
Related Party Transaction [Line Items]      
Number of related parties | related_party 1    
Principal Owner      
Related Party Transaction [Line Items]      
Number of related parties | related_party 1    
Affiliated Entity      
Related Party Transaction [Line Items]      
Trade receivables from DGW KG $ 773   $ 522
Trade payables to DGW KG 13,895   $ 17,871
Purchased carbon black products from DGW KG 21,322 $ 22,765  
Sales and services provided to DGW KG $ 634 $ 663