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Stock-Based Compensation - Narratives (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 4,433	$ 2,311	$ 16,631
Accelerated stock-based compensation expense			14,700
Share-based Payment Arrangement, Expense, Tax Benefit	$ 200	100	1,800
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	$ 4,000	$ 2,100	$ 14,600

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