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Derivative Financial Instruments (Narrative) (Details) R$ in Thousands, $ in Thousands, lbs in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 BRL (R$) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) lbs | Mar. 31, 2021 BRL (R$) lbs | Dec. 31, 2020 USD ($) lbs
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | $ 400 |  |
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months |  | $ (1,800) |  |  |
Aluminum Futures Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  | $ 10,400 |  | $ 12,100
Commitment Under Cash Flow Hedges, Mass | lbs |  |  | 10.5 | 10.5 | 13.0
Terphane Ltda [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  | $ 12,465 | R$ 68,543 |
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  | 2,413 |  | $ 1,560
Derivative Liability, Fair Value, Gross Liability |  |  | $ 0 |  | $ 22
Oct-2018 [Member] | Terphane Ltda [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar | R$ | R$ 119,000 |  |  |  |

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