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Related Parties - Narrative and Schedule of Related Party Transactions (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
related_party
Sep. 30, 2019
USD ($)
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 $ 510   $ 510   $ 537
Trade payables to DGW KG 9,142   9,142   $ 17,671
Purchased carbon black products from DGW KG 17,009 $ 19,312 49,002 $ 65,387  
Sales and services/(refund) provided to DGW KG $ 1,396 $ 596 $ 1,376 $ 2,087