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Derivative Financial Instruments (Narrative) (Details) R$ in Thousands, $ in Thousands, lbs in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) lbs	Sep. 30, 2021 BRL (R$)	Sep. 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	$ 900
Amounts of unrealized after tax gains (losses) to be Reclassified within Twelve Months	(2,900)
Aluminum Futures Contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 18,700			$ 12,100
Commitment Under Cash Flow Hedges, Mass | lbs	13.9		13.9	13.0
Terphane Ltda [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 24,456		R$ 134,781
Accrued Expenses [Member] | Derivatives Designated As Hedging Instruments [Member] | Aluminum Futures Contracts
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3,996			$ 1,560
Derivative Liability, Fair Value, Gross Liability	$ 1			$ 22
Oct-2018 [Member] | Terphane Ltda [Member]
Derivative [Line Items]
Annual Net Costs Mismatch Translation Exposure - Real vs US Dollar | R$		R$ 150,000

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