Debt and Liquidity (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Delayed Draw Term Loan (DDTL)
Debt Instrument [Line Items]
Long-term debt, gross	$ 100,000
Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Fair Value of Debt	$ 875,600	$ 905,800

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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+ Details

GRAFTECH INTERNATIONAL LTD 10-Q