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Stock-Based Compensation - Narratives (Details 2) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 2,311 $ 16,631 $ 2,665
Accelerated stock-based compensation expense $ 14,700   14,700  
Share-based Payment Arrangement, Expense, Tax Benefit   $ 100 1,800 500
Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense     13,800  
Plan | Brookfield | GrafTech International Ltd        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity Method Investment, Ownership Percentage 30.00% 30.00%    
Scenario, Adjustment        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Accelerated stock-based compensation expense     900  
Scenario, Adjustment | Brookfield | GrafTech International Ltd        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity Method Investment, Ownership Percentage 35.00%      
Selling, General and Administrative Expenses        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense   $ 2,100 $ 14,600 $ 2,300