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Derivative Financial Instruments (Narrative) (Details) R$ in Thousands, $ in Thousands, lbs in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 USD ($) lbs | Jun. 30, 2022 BRL (R$) | Jun. 30, 2022 BRL (R$) lbs | Dec. 31, 2021 USD ($) lbs
Derivative [Line Items] |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ (1,000) |  |  |
Aluminum Futures Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 32,700 |  |  | $ 22,100
Commitment Under Cash Flow Hedges, Mass | lbs | 19.1 |  | 19.1 | 14.9
Terphane Ltda [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 33,680 |  | R$ 189,414 |
Terphane Ltda [Member] | Oct-2018 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar | R$ |  | R$ 150,000 |  |

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