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Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Total Revenues $ 620,500 $ 1,281,250 $ 1,345,788
Graphite Electrodes - LTAs      
Disaggregation of Revenue [Line Items]      
Total Revenues 253,262 870,287 1,040,214
Graphite Electrodes - Non-LTAs      
Disaggregation of Revenue [Line Items]      
Total Revenues 338,746 351,140 258,426
Other      
Disaggregation of Revenue [Line Items]      
Total Revenues $ 28,492 $ 59,823 $ 47,148