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Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Total Revenues $ 1,345,788 $ 1,224,361 $ 1,790,793
Graphite Electrodes - LTAs      
Disaggregation of Revenue [Line Items]      
Total Revenues 1,040,214 1,069,772 1,437,354
Graphite Electrodes - Non-LTAs      
Disaggregation of Revenue [Line Items]      
Total Revenues 258,426 123,845 260,979
By-products and other      
Disaggregation of Revenue [Line Items]      
Total Revenues $ 47,148 $ 30,744 $ 92,460