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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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