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Contingencies (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	May 26, 2021	Jun. 30, 2021	Dec. 31, 2020
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease)
Balance as of December 31, 2020		$ 1,997
Product warranty accruals and adjustments		722
Settlements		(793)
Balance as of June 30, 2021		$ 1,926	$ 1,997
Loss Contingencies
Related party tax agreement percent of savings		85.00%
Due to Related Parties		$ 19,100	40,900
due to related party		3,922	21,752
Long-term debt - affiliate		$ 15,176	$ 19,098
Outstanding Voting Power Percentage Scenario 1		30.00%
Loss Contingency Accrual, Payments		$ 61,500
GrafTech International Ltd | Brookfield
Loss Contingencies
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions	24.00%	23.90%	55.30%
Cost of sales
Loss Contingencies
Loss Contingency, Loss in Period		$ 30,700
Selling, General and Administrative Expenses
Loss Contingencies
Loss Contingency, Loss in Period		$ 42,700
LIBO
Loss Contingencies
Due to Related Party, Basis Spread on Variable Rate		0.0100
Minimum
Loss Contingencies
Loss Contingency, Loss in Period		$ 73,400
Profit Units [Member] | Long-term Incentive Plan [Member]
Loss Contingencies
Number of shares authorized		30,000
Award vesting period		5 years
Outstanding Voting Power Percentage Minimum		0.30

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