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Related Parties - Narrative and Schedule of Related Party Transactions (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
related_party
Sep. 30, 2018
USD ($)
Dec. 31, 2018
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 $ 520   $ 520   $ 651
Trade payables to DGW KG 14,290   14,290   $ 18,615
Purchased carbon black products from DGW KG 19,312 $ 20,412 65,387 $ 68,702  
Sales and services provided to DGW KG $ 596 $ 2,674 $ 2,087 $ 4,077