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Derivative Financial Instruments (Narrative) (Details) R$ in Thousands, $ in Thousands, lbs in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 BRL (R$) | Mar. 31, 2022 USD ($) | Jun. 30, 2021 USD ($) lbs | Jun. 30, 2021 BRL (R$) lbs | Dec. 31, 2020 USD ($) lbs
Derivative [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | $ 800 |  |
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months |  | $ (2,400) |  |  |
Aluminum Futures Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  | $ 13,900 |  | $ 12,100
Commitment Under Cash Flow Hedges, Mass | lbs |  |  | 12.4 | 12.4 | 13.0
Terphane Ltda [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount |  |  | $ 8,465 | R$ 46,619 |
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  | 3,244 |  | $ 1,560
Derivative Liability, Fair Value, Gross Liability |  |  | $ 8 |  | $ 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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