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Retirement Plans And Postretirement Benefits (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2002
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Option to Remain in Plan, Period       5 years
Defined benefit plan, accumulated benefit obligation $ 129,500,000 $ 166,100,000    
Defined Contribution Plan, Employer Discretionary Contribution Amount 3,000,000 2,500,000 $ 2,200,000  
Mark-to-market adjustment $ 9,600,000 3,800,000 (3,200,000)  
Defined Benefit Plan, maximum salary increase       6.00%
Scenario, Adjustment        
Defined Benefit Plan Disclosure [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 45.00%      
Plan        
Defined Benefit Plan Disclosure [Line Items]        
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 5.00%      
Union Carbide | GrafTech International Ltd        
Defined Benefit Plan Disclosure [Line Items]        
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions       50.00%
Postemployment Retirement Benefit        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions $ 1,200,000 1,400,000    
Defined Benefit Plan, Benefit Obligation 13,500,000 16,000,000    
Net Cost 900,000 500,000 700,000  
Mark-to-market adjustment $ 1,600,000 $ 100,000 $ 100,000