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Related Parties - Narrative and Schedule of Related Party Transactions (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
related_party
Jun. 30, 2019
USD ($)
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 $ 25   $ 25   $ 478
Trade payables to DGW KG 9,412   9,412   $ 16,505
Purchased carbon black products from DGW KG 10,671 $ 23,309 31,993 $ 46,075  
Sales and services/(refund) provided to DGW KG $ (654) $ (829) $ (21) $ (1,491)