Retirement Plans And Postretirement Benefits (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2001
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Option to Remain in Plan, Period				5 years
Defined benefit plan, accumulated benefit obligation	$ 166,100,000	$ 176,300,000
Defined Contribution Plan, Employer Discretionary Contribution Amount	2,500,000	2,200,000	$ 2,100,000
Mark-to-market adjustment	$ 3,800,000	(3,200,000)	(3,500,000)
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 [Member]
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	$ 1,400,000	1,300,000
Defined Benefit Plan, Benefit Obligation	16,000,000	17,200,000
Net Cost	500,000	700,000	1,600,000
Mark-to-market adjustment	$ 100,000	$ 100,000	$ (600,000)