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Derivative Financial Instruments (Narrative) (Details) R$ in Thousands, $ in Thousands, lbs in Millions | 3 Months Ended |  |
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Mar. 31, 2022 USD ($) lbs | Mar. 31, 2022 BRL (R$) | Mar. 31, 2022 BRL (R$) lbs | Dec. 31, 2021 USD ($) lbs
Derivative [Line Items] |  |  |  |
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months | $ (3,500) |  |  |
Aluminum Futures Contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 24,200 |  |  | $ 22,100
Commitment Under Cash Flow Hedges, Mass | lbs | 14.3 |  | 14.3 | 14.9
Terphane Ltda [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 22,801 |  | R$ 128,210 |
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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