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Revenue From Contracts with Customers - Narratives (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Jun. 30, 2021 | Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |  |
Receivables, net of allowance for doubtful accounts | $ 173,409 | $ 182,647
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Contract with Customer, Asset, Allowance for Credit Loss, Current | 1,800 | 1,500
Contract with Customer, Asset, Allowance for Credit Loss, Noncurrent | 300 | 1,200
Contract with Customer, Asset, before Allowance for Credit Loss | 2,100 | $ 2,700
Graphite Electrodes - Three-to-five-year take-or-pay contracts |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Reclassifications between long-term and current | $ (4,404) |
Minimum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable payment terms | 30 days |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable payment terms | 120 days |

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